Here is a list of most of the gangs in the game Grand Theft Auto: San Andreas that came out in 2004. The events of the game take place in 1992.
Grove Street Families
The Ballas
Varrios Los Aztecas
Los Santos Vagos
San Fierro Rifa
Triads
Da Nang Boys
The Mafia
GTA San Andreas: Gangs was written by Dan Houser.
GTA San Andreas: Gangs was produced by Rockstar Games.
Rockstar Games released GTA San Andreas: Gangs on Tue Oct 26 2004.