Spam comments on MOVED Bugzilla bugs
https://bugs.freedesktop.org/show_bug.cgi?id=19807 contains spam comments after the point that it was moved. I've locked the spammy accounts, but the spammers can (and do) just create new ones.
Is there anything a Bugzilla administrator can do to delete those comments? (I tried to find the right place in Administration but couldn't.)
Is it possible to lock MOVED bugs, or even entire products like dbus, so that they cannot receive any new comments?