Basically, members from this group have recently been going onto my SMP server and leaving offensive signs as well as mass amounts of griefing. And during this confusion, we banned their leader. So, who are they?
They don't just go to random servers. The "members" went to your server are just wannabe-avo. I've only seen the real members hit Reddit-related servers. Also, don't give these guys so much attention as if they're this new bad-ass internet organization. Apparently EVERYONE wants to be avo now. Just ignore them, and treat them as every other griefing group, cause that's all they are.
They are right to fear!
Meh, we have more than enough anti-grief tools to deal with them.