diff --git a/inc/activities/block.php b/inc/activities/block.php
new file mode 100644
index 0000000..b6e69d4
--- /dev/null
+++ b/inc/activities/block.php
@@ -0,0 +1,22 @@
+<?php
+namespace activities\block;
+
+require_once plugin_dir_path( __FILE__ ) . '/../blocks.php';
+require_once plugin_dir_path( __FILE__ ) . '/../actors.php';
+
+function handle( $actor, $activity ) {
+    if ( !array_key_exists( 'object', $activity ) ) {
+        return new \WP_Error(
+            'invalid_activity',
+            __( 'Expected an object', 'activitypub' ),
+            array( 'status' => 400 )
+        );
+    }
+    $actor_id = \actors\get_actor_id( $actor );
+    $res = \blocks\create_block( $actor_id, $activity['object'] );
+    if ( is_wp_error( $res ) ) {
+        return $res;
+    }
+    return $activity;
+}
+?>
diff --git a/inc/activities/like.php b/inc/activities/like.php
index e6db718..5c3c0eb 100644
--- a/inc/activities/like.php
+++ b/inc/activities/like.php
@@ -1,5 +1,5 @@
 <?php
-namespace activites\like;
+namespace activities\like;
 
 require_once plugin_dir_path( __FILE__ ) . '/../likes.php';
 require_once plugin_dir_path( __FILE__ ) . '/../actors.php';
diff --git a/inc/blocks.php b/inc/blocks.php
new file mode 100644
index 0000000..5bbb4d7
--- /dev/null
+++ b/inc/blocks.php
@@ -0,0 +1,34 @@
+<?php
+namespace blocks;
+
+/*
+If an actor is in another actor's block list, any activities
+from the blocked actor that go into the blocking actors' inbox 
+get ignored
+*/
+
+function create_block( $actor_id, $blocked_actor_url ) {
+    global $wpdb;
+    $res = $wpdb->insert(
+        'activitypub_blocks',
+        array( 'actor_id' => $actor_id, 'blocked_actor_url' => $blocked_actor_url )
+    );
+    if ( !$res ) {
+        return new \WP_Error( 'db_error', __( 'Error inserting block row', 'activitypub' ) );
+    }
+}
+
+function create_blocks_table() {
+    global $wpdb;
+    $wpdb->query(
+        "
+        CREATE TABLE IF NOT EXISTS activitypub_blocks(
+            actor_id INT UNSIGNED NOT NULL,
+            blocked_actor_url TEXT NOT NULL,
+            FOREIGN KEY actor_fk(actor_id)
+            REFERENCES activitypub_actors(id)
+        );
+        "
+    );
+}
+?>
diff --git a/inc/outbox.php b/inc/outbox.php
index 69b5814..e58c205 100644
--- a/inc/outbox.php
+++ b/inc/outbox.php
@@ -18,6 +18,7 @@ require_once plugin_dir_path( __FILE__ ) . '/activities/update.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities/delete.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities/like.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities/follow.php';
+require_once plugin_dir_path( __FILE__ ) . '/activities/block.php';
 
 function handle_activity( $actor, $activity ) {
     // TODO handle authentication/authorization
@@ -49,6 +50,7 @@ function handle_activity( $actor, $activity ) {
         $activity = \activities\like\handle( $actor, $activity );
         break;
     case 'Block':
+        $activity = \activities\block\handle( $actor, $activity );
         break;
     case 'Undo':
         break;