it depends if you want offcial factions or games ppl been playing in since went open.
Official factions are we started in Tanarus I believe this was the game that formed KGB then they went to uo pac, uo sp, daoc gawaine, then we branched to daoc andred (before daoc was an eq area but it wasn't an actual kgb from what I understand it was a bunch of x kgb'ers who went to play there together and formed their own guild) After Daoc we went to Shadowbane, first server Treachery, then Wrath then Vengeance. I believe when they moved to Vindication they were always the open faction state. Then there was also the other branch of KGB who were in Sb that played Corruption and Redemption.

After that we went to SWG Bloodfin and there was some on Flurry too(not sure if Flurry was an offcial KGB faction, I do remmeber their being forums for it) After SWG we came to Wow Archimonde where KGB disbanded from that world and at the time of that we were all Open factions on or around that time.

After we went Open we had a still strong presence on Vindication and Wrath once again, also a bit on Mourning. There was a large presence on Eve, Guildwars(which was actually during closed faction days but was not an offcial faction) Some still are playing Wow on another server.
Winter mentioned nwn2 and Knights online but i don't think we ever went there as a KGB presence other then a few people.
Then they were on uo Hybrid at least 3 times in the past sinec we've been an open faction state.

I believe that is it unless I think of something else.

[Linked Image from w3.the-kgb.com]