Angels of Doom [AoD]
Genome Toksentai [GT]
Genosha eXtinction Squad [gXs]
the_eXtermination_squad [tEs]
DAM_MAD

NOTE: Please forgive me if these links aren't accurate, or if the clan doesn't exist anymore. My only source is from PlanetShogo MAD listing, and I think their data is pretty old.