I've so far banned two of them, one of them just a day ago. If you see ANYONE with that tag, watch them closely and the moment they do something (and it seems they ALWAYS will), hit them with a 1 week ban.
I'd even say they warrant permanent ban without a demo, since the whole purpose of the clan is to be disruptive. Racism, mic spamming, exploits, player abuse, outright hacks... they do it all. They prey on unadministered servers.
I used to run an administration mod for TF2 that, by default, would kick and ban anyone who attempted to join with that tag in their name.