I would suggest looking through http://boards.cityofheroes.com/showthread.php?t=111673 for any Villain group advertisements.
You can also join some global channels, which too are listed at the top of the main Liberty forums page and inquire there. I don't know of too many that are recruiting or if they are even as active as you may want.
With Going Rogue a lot of people tend to stay rogue/vigilante so they can benefit from both sides of the game without having to be a part of an SG. It seems global channels are where most of the teaming and meeting of people are occurring. You might want to try a few different global channels.
Enjoy!
@Tax E - RIP CoH 2012
I'm a level 28 mind dominator/psionic.
I'm itching to join a nice group =D