diff --git a/app/assets/javascripts/discourse/app/lib/transform-post.js b/app/assets/javascripts/discourse/app/lib/transform-post.js
index efc1ac2882..e9c24b5708 100644
--- a/app/assets/javascripts/discourse/app/lib/transform-post.js
+++ b/app/assets/javascripts/discourse/app/lib/transform-post.js
@@ -122,6 +122,7 @@ export default function transformPost(
     currentUser && (currentUser.id === post.user_id || currentUser.staff);
   postAtts.canArchiveTopic = !!details.can_archive_topic;
   postAtts.canCloseTopic = !!details.can_close_topic;
+  postAtts.canSplitMergeTopic = !!details.can_split_merge_topic;
   postAtts.canEditStaffNotes = !!details.can_edit_staff_notes;
   postAtts.canReplyAsNewTopic = !!details.can_reply_as_new_topic;
   postAtts.canReviewTopic = !!details.can_review_topic;
diff --git a/app/assets/javascripts/discourse/app/widgets/post-stream.js b/app/assets/javascripts/discourse/app/widgets/post-stream.js
index 1ccb12f462..8905829ba7 100644
--- a/app/assets/javascripts/discourse/app/widgets/post-stream.js
+++ b/app/assets/javascripts/discourse/app/widgets/post-stream.js
@@ -94,7 +94,7 @@ export default createWidget("post-stream", {
       transformed.canCreatePost = attrs.canCreatePost;
       transformed.mobileView = mobileView;
 
-      if (transformed.canManage) {
+      if (transformed.canManage || transformed.canSplitMergeTopic) {
         transformed.multiSelect = attrs.multiSelect;
 
         if (attrs.multiSelect) {
diff --git a/app/assets/javascripts/discourse/app/widgets/topic-admin-menu.js b/app/assets/javascripts/discourse/app/widgets/topic-admin-menu.js
index ce74f3af14..e9190d024d 100644
--- a/app/assets/javascripts/discourse/app/widgets/topic-admin-menu.js
+++ b/app/assets/javascripts/discourse/app/widgets/topic-admin-menu.js
@@ -130,7 +130,10 @@ export default createWidget("topic-admin-menu", {
     const visible = topic.get("visible");
 
     // Admin actions
-    if (this.currentUser && this.currentUser.get("canManageTopic")) {
+    if (
+      this.get("currentUser.canManageTopic") ||
+      details.can_split_merge_topic
+    ) {
       this.addActionButton({
         className: "topic-admin-multi-select",
         buttonClass: "popup-menu-btn",
@@ -138,7 +141,9 @@ export default createWidget("topic-admin-menu", {
         icon: "tasks",
         label: "actions.multi_select"
       });
+    }
 
+    if (this.get("currentUser.canManageTopic")) {
       if (details.get("can_delete")) {
         this.addActionButton({
           className: "topic-admin-delete",
@@ -180,7 +185,7 @@ export default createWidget("topic-admin-menu", {
       }
     }
 
-    if (this.currentUser && this.currentUser.get("canManageTopic")) {
+    if (this.get("currentUser.canManageTopic")) {
       this.addActionButton({
         className: "topic-admin-status-update",
         buttonClass: "popup-menu-btn",
@@ -230,7 +235,7 @@ export default createWidget("topic-admin-menu", {
       }
     }
 
-    if (this.currentUser && this.currentUser.get("canManageTopic")) {
+    if (this.get("currentUser.canManageTopic")) {
       this.addActionButton({
         className: "topic-admin-visible",
         buttonClass: "popup-menu-btn",
diff --git a/app/controllers/topics_controller.rb b/app/controllers/topics_controller.rb
index 20be48a6ba..583d7ebeed 100644
--- a/app/controllers/topics_controller.rb
+++ b/app/controllers/topics_controller.rb
@@ -711,6 +711,9 @@ class TopicsController < ApplicationController
     topic = Topic.find_by(id: topic_id)
     guardian.ensure_can_move_posts!(topic)
 
+    destination_topic = Topic.find_by(id: destination_topic_id)
+    guardian.ensure_can_create_post_on_topic!(destination_topic)
+
     args = {}
     args[:destination_topic_id] = destination_topic_id.to_i
 
@@ -736,9 +739,15 @@ class TopicsController < ApplicationController
     topic = Topic.with_deleted.find_by(id: topic_id)
     guardian.ensure_can_move_posts!(topic)
 
-    # when creating a new topic, ensure the 1st post is a regular post
-    if params[:title].present? && Post.where(topic: topic, id: post_ids).order(:post_number).pluck_first(:post_type) != Post.types[:regular]
-      return render_json_error("When moving posts to a new topic, the first post must be a regular post.")
+    if params[:title].present?
+      # when creating a new topic, ensure the 1st post is a regular post
+      if Post.where(topic: topic, id: post_ids).order(:post_number).pluck_first(:post_type) != Post.types[:regular]
+        return render_json_error("When moving posts to a new topic, the first post must be a regular post.")
+      end
+
+      if params[:category_id].present?
+        guardian.ensure_can_create_topic_on_category!(params[:category_id])
+      end
     end
 
     destination_topic = move_posts_to_destination(topic)
diff --git a/app/serializers/topic_view_details_serializer.rb b/app/serializers/topic_view_details_serializer.rb
index e996722538..51c99d9905 100644
--- a/app/serializers/topic_view_details_serializer.rb
+++ b/app/serializers/topic_view_details_serializer.rb
@@ -19,6 +19,7 @@ class TopicViewDetailsSerializer < ApplicationSerializer
      :can_publish_page,
      :can_close_topic,
      :can_archive_topic,
+     :can_split_merge_topic,
      :can_edit_staff_notes]
   end
 
@@ -142,6 +143,7 @@ class TopicViewDetailsSerializer < ApplicationSerializer
   end
   alias :include_can_close_topic? :can_perform_action_available_to_group_moderators?
   alias :include_can_archive_topic? :can_perform_action_available_to_group_moderators?
+  alias :include_can_split_merge_topic? :can_perform_action_available_to_group_moderators?
   alias :include_can_edit_staff_notes? :can_perform_action_available_to_group_moderators?
 
   def include_can_publish_page?
diff --git a/lib/guardian.rb b/lib/guardian.rb
index be5378e26d..7e565b3f49 100644
--- a/lib/guardian.rb
+++ b/lib/guardian.rb
@@ -172,7 +172,6 @@ class Guardian
   def can_moderate?(obj)
     obj && authenticated? && !is_silenced? && (is_staff? || (obj.is_a?(Topic) && @user.has_trust_level?(TrustLevel[4])))
   end
-  alias :can_move_posts? :can_moderate?
   alias :can_see_flags? :can_moderate?
 
   def can_tag?(topic)
diff --git a/lib/guardian/topic_guardian.rb b/lib/guardian/topic_guardian.rb
index 60a7c37102..1cd93e4a83 100644
--- a/lib/guardian/topic_guardian.rb
+++ b/lib/guardian/topic_guardian.rb
@@ -210,6 +210,12 @@ module TopicGuardian
   end
   alias :can_archive_topic? :can_perform_action_available_to_group_moderators?
   alias :can_close_topic? :can_perform_action_available_to_group_moderators?
+  alias :can_split_merge_topic? :can_perform_action_available_to_group_moderators?
   alias :can_edit_staff_notes? :can_perform_action_available_to_group_moderators?
 
+  def can_move_posts?(topic)
+    return false if is_silenced?
+    can_perform_action_available_to_group_moderators?(topic)
+  end
+
 end
diff --git a/spec/requests/topics_controller_spec.rb b/spec/requests/topics_controller_spec.rb
index 83c0ae9e00..3f59df457d 100644
--- a/spec/requests/topics_controller_spec.rb
+++ b/spec/requests/topics_controller_spec.rb
@@ -99,6 +99,8 @@ RSpec.describe TopicsController do
       end
 
       context 'success' do
+        fab!(:category) { Fabricate(:category) }
+
         before { sign_in(admin) }
 
         it "returns success" do
@@ -106,7 +108,7 @@ RSpec.describe TopicsController do
             post "/t/#{topic.id}/move-posts.json", params: {
               title: 'Logan is a good movie',
               post_ids: [p2.id],
-              category_id: 123,
+              category_id: category.id,
               tags: ["tag1", "tag2"]
             }
           end.to change { Topic.count }.by(1)
@@ -130,7 +132,7 @@ RSpec.describe TopicsController do
               post "/t/#{topic.id}/move-posts.json", params: {
                 title: 'Logan is a good movie',
                 post_ids: [p2.id],
-                category_id: 123
+                category_id: category.id
               }
             end.to change { Topic.count }.by(1)
 
@@ -185,6 +187,59 @@ RSpec.describe TopicsController do
       end
     end
 
+    describe "moving to a new topic as a group moderator" do
+      fab!(:group_user) { Fabricate(:group_user) }
+      fab!(:category) { Fabricate(:category, reviewable_by_group: group_user.group) }
+      fab!(:topic) { Fabricate(:topic, category: category) }
+      fab!(:p1) { Fabricate(:post, user: group_user.user, post_number: 1, topic: topic) }
+      fab!(:p2) { Fabricate(:post, user: group_user.user, post_number: 2, topic: topic) }
+      let(:user) { group_user.user }
+
+      before do
+        sign_in(user)
+        SiteSetting.enable_category_group_moderation = true
+      end
+
+      it "moves the posts" do
+        expect do
+          post "/t/#{topic.id}/move-posts.json", params: {
+            title: 'Logan is a good movie',
+            post_ids: [p2.id],
+            category_id: category.id
+          }
+        end.to change { Topic.count }.by(1)
+
+        expect(response.status).to eq(200)
+        result = response.parsed_body
+        expect(result['success']).to eq(true)
+        expect(result['url']).to eq(Topic.last.relative_url)
+      end
+
+      it "does not allow posts to be moved to a private category" do
+        staff_category = Fabricate(:category)
+        staff_category.set_permissions(staff: :full)
+        staff_category.save!
+
+        post "/t/#{topic.id}/move-posts.json", params: {
+          title: 'Logan is a good movie',
+          post_ids: [p2.id],
+          category_id: staff_category.id
+        }
+
+        expect(response).to be_forbidden
+      end
+
+      it "does not allow posts outside of the category to be moved" do
+        topic.update!(category: nil)
+
+        post "/t/#{topic.id}/move-posts.json", params: {
+          title: 'blah', post_ids: [p1.post_number, p2.post_number]
+        }
+
+        expect(response).to be_forbidden
+      end
+    end
+
     describe 'moving to an existing topic' do
       let!(:user) { sign_in(moderator) }
       let(:p1) { Fabricate(:post, user: user) }
@@ -246,6 +301,59 @@ RSpec.describe TopicsController do
       end
     end
 
+    describe "moving to an existing topic as a group moderator" do
+      fab!(:group_user) { Fabricate(:group_user) }
+      fab!(:category) { Fabricate(:category, reviewable_by_group: group_user.group) }
+      fab!(:topic) { Fabricate(:topic, category: category) }
+      fab!(:p1) { Fabricate(:post, user: group_user.user, post_number: 1, topic: topic) }
+      fab!(:p2) { Fabricate(:post, user: group_user.user, post_number: 2, topic: topic) }
+      fab!(:dest_topic) { Fabricate(:topic) }
+
+      let(:user) { group_user.user }
+
+      before do
+        sign_in(user)
+        SiteSetting.enable_category_group_moderation = true
+      end
+
+      it "moves the posts" do
+        post "/t/#{topic.id}/move-posts.json", params: {
+          post_ids: [p2.id],
+          destination_topic_id: dest_topic.id
+        }
+
+        expect(response.status).to eq(200)
+        result = response.parsed_body
+        expect(result['success']).to eq(true)
+        expect(result['url']).to be_present
+      end
+
+      it "does not allow posts to be moved to a private category" do
+        staff_category = Fabricate(:category)
+        staff_category.set_permissions(staff: :full)
+        staff_category.save!
+        dest_topic.update!(category: staff_category)
+
+        post "/t/#{topic.id}/move-posts.json", params: {
+          post_ids: [p2.id],
+          destination_topic_id: dest_topic.id
+        }
+
+        expect(response).to be_forbidden
+      end
+
+      it "does not allow posts outside of the category to be moved" do
+        topic.update!(category: nil)
+
+        post "/t/#{topic.id}/move-posts.json", params: {
+          post_ids: [p1.post_number, p2.post_number],
+          destination_topic_id: dest_topic.id
+        }
+
+        expect(response).to be_forbidden
+      end
+    end
+
     describe 'moving to a new message' do
       let!(:message) { Fabricate(:private_message_topic) }
       let!(:p1) { Fabricate(:post, user: user, post_number: 1, topic: message) }
@@ -417,6 +525,55 @@ RSpec.describe TopicsController do
       end
     end
 
+    describe "merging into another topic as a group moderator" do
+      fab!(:group_user) { Fabricate(:group_user) }
+      fab!(:category) { Fabricate(:category, reviewable_by_group: group_user.group) }
+      fab!(:topic) { Fabricate(:topic, category: category) }
+      fab!(:p1) { Fabricate(:post, post_number: 1, topic: topic) }
+      fab!(:p2) { Fabricate(:post, post_number: 2, topic: topic) }
+      fab!(:dest_topic) { Fabricate(:topic) }
+      let(:user) { group_user.user }
+
+      before do
+        sign_in(user)
+        SiteSetting.enable_category_group_moderation = true
+      end
+
+      it "moves the posts" do
+        post "/t/#{topic.id}/merge-topic.json", params: {
+          destination_topic_id: dest_topic.id
+        }
+
+        expect(response.status).to eq(200)
+        result = response.parsed_body
+        expect(result['success']).to eq(true)
+        expect(result['url']).to be_present
+      end
+
+      it "does not allow posts to be moved to a private category" do
+        staff_category = Fabricate(:category)
+        staff_category.set_permissions(staff: :full)
+        staff_category.save!
+        dest_topic.update!(category: staff_category)
+
+        post "/t/#{topic.id}/merge-topic.json", params: {
+          destination_topic_id: dest_topic.id
+        }
+
+        expect(response).to be_forbidden
+      end
+
+      it "does not allow posts outside of the category to be moved" do
+        topic.update!(category: nil)
+
+        post "/t/#{topic.id}/merge-topic.json", params: {
+          destination_topic_id: dest_topic.id
+        }
+
+        expect(response).to be_forbidden
+      end
+    end
+
     describe 'merging into another message' do
       let(:message) { Fabricate(:private_message_topic, user: user) }
       let!(:p1) { Fabricate(:post, topic: message, user: trust_level_4) }
@@ -708,9 +865,7 @@ RSpec.describe TopicsController do
       fab!(:group_user) { Fabricate(:group_user) }
       fab!(:category) { Fabricate(:category, reviewable_by_group: group_user.group) }
       fab!(:topic) { Fabricate(:topic, category: category) }
-
       let(:user) { group_user.user }
-      let(:group) { group_user.group }
 
       before do
         sign_in(user)
@@ -743,7 +898,6 @@ RSpec.describe TopicsController do
         expect(response.status).to eq(403)
         expect(topic.reload.pinned_at).to eq(nil)
       end
-
     end
   end
 
diff --git a/test/javascripts/acceptance/topic-move-posts-test.js b/test/javascripts/acceptance/topic-move-posts-test.js
index 8d9124f440..d867c2a063 100644
--- a/test/javascripts/acceptance/topic-move-posts-test.js
+++ b/test/javascripts/acceptance/topic-move-posts-test.js
@@ -120,3 +120,27 @@ QUnit.test("moving posts from personal message", async assert => {
     "it shows an option to move to existing message"
   );
 });
+
+QUnit.test("group moderator moving posts", async assert => {
+  await visit("/t/topic-for-group-moderators/2480");
+  await click(".toggle-admin-menu");
+  await click(".topic-admin-multi-select .btn");
+  await click("#post_2 .select-below");
+
+  assert.equal(
+    find(".selected-posts .move-to-topic")
+      .text()
+      .trim(),
+    I18n.t("topic.move_to.action"),
+    "it should show the move to button"
+  );
+
+  await click(".selected-posts .move-to-topic");
+
+  assert.ok(
+    find(".choose-topic-modal .title")
+      .html()
+      .includes(I18n.t("topic.move_to.title")),
+    "it opens move to modal"
+  );
+});
diff --git a/test/javascripts/fixtures/topic.js b/test/javascripts/fixtures/topic.js
index 6b91b712fa..0a39bae2de 100644
--- a/test/javascripts/fixtures/topic.js
+++ b/test/javascripts/fixtures/topic.js
@@ -5077,340 +5077,342 @@ export default {
     pm_with_non_human_user: false
   },
   "/t/2480/1.json": {
-    "post_stream": {
-      "posts": [
+    post_stream: {
+      posts: [
         {
-          "id": 41,
-          "name": "",
-          "username": "group_moderator",
-          "avatar_template": "/images/avatar.png",
-          "created_at": "2020-07-24T17:48:55.419Z",
-          "cooked": "<p>Here is my new topic. I am a group category moderator!</p>",
-          "post_number": 1,
-          "post_type": 1,
-          "updated_at": "2020-07-24T17:48:55.419Z",
-          "reply_count": 0,
-          "reply_to_post_number": null,
-          "quote_count": 0,
-          "incoming_link_count": 0,
-          "reads": 2,
-          "readers_count": 1,
-          "score": 0,
-          "yours": true,
-          "topic_id": 2480,
-          "topic_slug": "a-topic-with-group-category-moderators",
-          "display_username": "",
-          "primary_group_name": "group_moderators",
-          "primary_group_flair_url": "cheese",
-          "primary_group_flair_bg_color": "ff0",
-          "primary_group_flair_color": "",
-          "version": 1,
-          "can_edit": true,
-          "can_delete": false,
-          "can_recover": false,
-          "can_wiki": false,
-          "read": true,
-          "user_title": "a title",
-          "title_is_group": false,
-          "bookmarked": false,
-          "actions_summary": [
+          id: 41,
+          name: "",
+          username: "group_moderator",
+          avatar_template: "/images/avatar.png",
+          created_at: "2020-07-24T17:48:55.419Z",
+          cooked: "<p>Here is my new topic. I am a group category moderator!</p>",
+          post_number: 1,
+          post_type: 1,
+          updated_at: "2020-07-24T17:48:55.419Z",
+          reply_count: 0,
+          reply_to_post_number: null,
+          quote_count: 0,
+          incoming_link_count: 0,
+          reads: 2,
+          readers_count: 1,
+          score: 0,
+          yours: true,
+          topic_id: 2480,
+          topic_slug: "a-topic-with-group-category-moderators",
+          display_username: "",
+          primary_group_name: "group_moderators",
+          primary_group_flair_url: "cheese",
+          primary_group_flair_bg_color: "ff0",
+          primary_group_flair_color: "",
+          version: 1,
+          can_edit: true,
+          can_delete: false,
+          can_recover: false,
+          can_wiki: false,
+          read: true,
+          user_title: "a title",
+          title_is_group: false,
+          bookmarked: false,
+          actions_summary: [
             {
-              "id": 3,
-              "can_act": true
+              id: 3,
+              can_act: true
             },
             {
-              "id": 4,
-              "can_act": true
+              id: 4,
+              can_act: true
             },
             {
-              "id": 8,
-              "can_act": true
+              id: 8,
+              can_act: true
             },
             {
-              "id": 7,
-              "can_act": true
+              id: 7,
+              can_act: true
             }
           ],
-          "moderator": false,
-          "admin": false,
-          "staff": false,
-          "group_moderator": true,
-          "user_id": 3,
-          "hidden": false,
-          "trust_level": 1,
-          "deleted_at": null,
-          "user_deleted": false,
-          "edit_reason": null,
-          "can_view_edit_history": true,
-          "wiki": false,
-          "reviewable_id": 0,
-          "reviewable_score_count": 0,
-          "reviewable_score_pending_count": 0
+          moderator: false,
+          admin: false,
+          staff: false,
+          group_moderator: true,
+          user_id: 3,
+          hidden: false,
+          trust_level: 1,
+          deleted_at: null,
+          user_deleted: false,
+          edit_reason: null,
+          can_view_edit_history: true,
+          wiki: false,
+          reviewable_id: 0,
+          reviewable_score_count: 0,
+          reviewable_score_pending_count: 0
         },
         {
-          "id": 42,
-          "name": "",
-          "username": "normal_user",
-          "avatar_template": "/images/avatar.png",
-          "created_at": "2020-07-24T17:50:01.263Z",
-          "cooked": "<p>A fascinating topic worthy of discussion.</p>",
-          "post_number": 2,
-          "post_type": 1,
-          "updated_at": "2020-07-24T17:50:01.263Z",
-          "reply_count": 0,
-          "reply_to_post_number": null,
-          "quote_count": 0,
-          "incoming_link_count": 0,
-          "reads": 2,
-          "readers_count": 1,
-          "score": 0,
-          "yours": false,
-          "topic_id": 2480,
-          "topic_slug": "a-topic-with-group-category-moderators",
-          "display_username": "",
-          "primary_group_name": null,
-          "primary_group_flair_url": null,
-          "primary_group_flair_bg_color": null,
-          "primary_group_flair_color": null,
-          "version": 1,
-          "can_edit": false,
-          "can_delete": false,
-          "can_recover": false,
-          "can_wiki": false,
-          "read": true,
-          "user_title": null,
-          "bookmarked": false,
-          "actions_summary": [
+          id: 42,
+          name: "",
+          username: "normal_user",
+          avatar_template: "/images/avatar.png",
+          created_at: "2020-07-24T17:50:01.263Z",
+          cooked: "<p>A fascinating topic worthy of discussion.</p>",
+          post_number: 2,
+          post_type: 1,
+          updated_at: "2020-07-24T17:50:01.263Z",
+          reply_count: 0,
+          reply_to_post_number: null,
+          quote_count: 0,
+          incoming_link_count: 0,
+          reads: 2,
+          readers_count: 1,
+          score: 0,
+          yours: false,
+          topic_id: 2480,
+          topic_slug: "a-topic-with-group-category-moderators",
+          display_username: "",
+          primary_group_name: null,
+          primary_group_flair_url: null,
+          primary_group_flair_bg_color: null,
+          primary_group_flair_color: null,
+          version: 1,
+          can_edit: false,
+          can_delete: false,
+          can_recover: false,
+          can_wiki: false,
+          read: true,
+          user_title: null,
+          bookmarked: false,
+          actions_summary: [
             {
-              "id": 2,
-              "can_act": true
+              id: 2,
+              can_act: true
             },
             {
-              "id": 3,
-              "can_act": true
+              id: 3,
+              can_act: true
             },
             {
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