a quick search shows w00w00 would be connected. Not sure of the others, but I (and I'm sure you do too) know of at least MoD, TESO, ADM folks who came through there.

Not saying all groups by any means, but even with being a few years late getting started in the infosec world of Atlanta there were still a lot of old guard hackers hanging around when I got out of school and people still felt comfortable sharing stories from time to time.