diff --git a/app/sdk/src/focus.ts b/app/sdk/src/focus.ts
index 84397f71..7cb1b354 100644
--- a/app/sdk/src/focus.ts
+++ b/app/sdk/src/focus.ts
@@ -16,7 +16,9 @@ import { getContactChannelTopicDetail } from './net/getContactChannelTopicDetail
 import { addChannelTopic } from './net/addChannelTopic';
 import { addContactChannelTopic } from './net/addContactChannelTopic';
 import { setChannelTopicSubject } from './net/setChannelTopicSubject';
-import { addContactChannelTopicSubject } from './net/setContactChannelTopicSubject';
+import { setContactChannelTopicSubject } from './net/setContactChannelTopicSubject';
+import { removeChannelTopic } from './net/removeChannelTopic';
+import { removeContactChannelTopic } from './net/removeContactChannelTopic';
 
 const BATCH_COUNT = 64;
 const MIN_LOAD_SIZE = 32;
@@ -1081,6 +1083,19 @@ export class FocusModule implements Focus {
     }
   }
 
+  private async removeRemoveChannelTopic(topicId: string) {
+    const { cardId, channelId, connection } = this;
+    if (!connection) {
+      throw new Error('disconnected from channel');
+    }
+    const { node, secure, token } = this.connection;
+    if (cardId) {
+      return await removeContactChannelTopicSubject(node, secure, token, channelId, topicId);
+    } else {
+      return await removeChannelTopic(node, secure, token, channelId, topicId);
+    }
+  }
+
   private isTopicBlocked(topicId: string): boolean {
     const { cardId, channelId } = this;
     const card = cardId ? `"${cardId}"` : 'null';
diff --git a/app/sdk/src/net/removeChannelTopic.ts b/app/sdk/src/net/removeChannelTopic.ts
new file mode 100644
index 00000000..a1b58aa3
--- /dev/null
+++ b/app/sdk/src/net/removeChannelTopic.ts
@@ -0,0 +1,7 @@
+import { checkResponse, fetchWithTimeout } from './fetchUtil';
+
+export async function removeChannelTopic(node: string, secure: boolean, token: string, channelId: string, topicId: string): Promise<void> {
+  const endpoint = `http${secure ? 's' : ''}://${node}/content/channels/${channelId}/${topics}/${topicId}?agent=${token}`;
+  const { status } = await fetchWithTimeout(endpoint, { method: 'DELETE' });
+  checkResponse(status);
+}
diff --git a/app/sdk/src/net/removeContactChannelTopic.ts b/app/sdk/src/net/removeContactChannelTopic.ts
new file mode 100644
index 00000000..2b225855
--- /dev/null
+++ b/app/sdk/src/net/removeContactChannelTopic.ts
@@ -0,0 +1,7 @@
+import { checkResponse, fetchWithTimeout } from './fetchUtil';
+
+export async function removeContactChannelTopic(node: string, secure: boolean, guidToken: string, channelId: string) {
+  const endpoint = `http${secure ? 's' : ''}://${node}/content/channels/${channelId}/topics/${topicId}?contact=${guidToken}`;
+  const response = await fetchWithTimeout(endpoint, { method: 'DELETE' });
+  checkResponse(response.status);
+}
diff --git a/app/sdk/src/net/setContactChannelTopicSubject.ts b/app/sdk/src/net/setContactChannelTopicSubject.ts
index cc3c6c14..778e9d9f 100644
--- a/app/sdk/src/net/setContactChannelTopicSubject.ts
+++ b/app/sdk/src/net/setContactChannelTopicSubject.ts
@@ -1,6 +1,6 @@
 import { checkResponse, fetchWithTimeout } from './fetchUtil';
 
-export async function setContactChannelTopicSubject(node: string, secure: boolean, guidToken: string, channelId: topicId: string, dataType: string, data: any) {
+export async function setContactChannelTopicSubject(node: string, secure: boolean, guidToken: string, channelId: string, topicId: string, dataType: string, data: any) {
   const subject = { data: JSON.stringify(data), dataType };
   const endpoint = `http${secure ? 's' : '' }://${node}/content/channels/${channelId}/topics/${topicId}/subject?contact=${guidToken}&confirm=true`;
   const { status } = await fetchWithTimeout(endpoint, { method: 'PUT', body: JSON.stringify(subject) });