diff --git a/bookwyrm/views/preferences/block.py b/bookwyrm/views/preferences/block.py
index 1eccf4612..2ccd3c065 100644
--- a/bookwyrm/views/preferences/block.py
+++ b/bookwyrm/views/preferences/block.py
@@ -23,6 +23,10 @@ class Block(View):
         models.UserBlocks.objects.create(
             user_subject=request.user, user_object=to_block
         )
+        # remove the blocked users's lists from the groups
+        models.List.remove_from_group(request.user, to_block)
+        # remove the blocked user from all blocker's owned groups
+        models.GroupMember.remove(request.user, to_block)
         return redirect("prefs-block")