Enemy Territory had a tk clan. You all seem unconcerned but I promise you if a full time tk clan starts up on bf2 you will all have something to say.

These guys ruined wolfenstein for me. Their rules are simple.. if they tk you (accidently or otherwise) and you punish, they would spend the rest of the map targeting you for tk's. No amount of reasoning would work for it. Even kill for kill didn't work.

They had a website but never divulged the address and they seem to have quite a few members.