Very Short List recommended this blog entry featuring Chicago street gang cards from the days of yore.
The We Are Supervision blog has a wild collection of the business cards that Chicago's gangs printed up in the seventies and eighties and used to make friends and intimidate people.
You'll see groups like the Stooge Bros. (whose members included Bubbles, Giggles, and Sweet Pea) and Thee Almighty Hells Devils (whose members included Sico, Satan, and Skull).
The above card looks like one that Luther ("Warriors, come out to play-ay-ay"), warlord of The Rogues, would have had.
Street gang calling cards from the 1970s and 1980s