diff --git bp-activity/bp-activity-template.php bp-activity/bp-activity-template.php
index 4a6577c..552401a 100644
--- bp-activity/bp-activity-template.php
+++ bp-activity/bp-activity-template.php
@@ -868,6 +868,38 @@ function bp_activity_type() {
 	function bp_get_activity_action_name() { return bp_get_activity_type(); }
 
 /**
+ * Outputs the activity component
+ *
+ * @since BuddyPress (1.7)
+ *
+ * @uses bp_get_activity_component()
+ */
+function bp_activity_component() {
+	echo bp_get_activity_component();
+}
+	/**
+	 * Returns the component of the current activity item
+	 *
+	 * @since BuddyPress (1.7)
+	 *
+	 * @global object $activities_template {@link BP_Activity_Template}
+	 * @uses apply_filters() Filter 'bp_get_activity_component' to modify
+	 *
+	 * @return string The component of the current activity
+	 */
+	function bp_get_activity_component() {
+		global $activities_template;
+
+		$component = false;
+
+		if ( isset( $activities_template->activity->component ) ) {
+			$component = $activities_template->activity->component;
+		}
+
+		return apply_filters( 'bp_get_activity_component', $component );
+	}
+
+/**
  * Outputs the activity user id
  *
  * @since BuddyPress (1.1)
diff --git bp-groups/bp-groups-filters.php bp-groups/bp-groups-filters.php
index 08b9040..9ef0847 100644
--- bp-groups/bp-groups-filters.php
+++ bp-groups/bp-groups-filters.php
@@ -169,3 +169,24 @@ function groups_filter_forums_root_page_sql( $sql ) {
 	return apply_filters( 'groups_filter_bbpress_root_page_sql', 't.topic_id' );
 }
 add_filter( 'get_latest_topics_fields', 'groups_filter_forums_root_page_sql' );
+
+/**
+ * Keep blocked group members from replying to activity items in that group
+ *
+ * @since BuddyPress (1.7)
+ *
+ * @param bool $can_comment
+ * @return bool
+ */
+function bp_groups_activity_can_comment( $can_comment ) {
+	if ( buddypress()->groups->id == bp_get_activity_component() &&
+	     is_user_logged_in() &&
+	     ! current_user_can( 'bp_moderate' ) &&
+	     groups_is_user_banned( bp_loggedin_user_id(), bp_get_activity_item_id() )
+	   ) {
+		$can_comment = false;
+	}
+
+	return $can_comment;
+}
+add_filter( 'bp_activity_can_comment', 'bp_groups_activity_can_comment' );