A group of close people that run in a pack. Usually once your in a gang and past the initiation, you'll only escape the gang thru death. Gangs represent themselves with certain colors, hand signs, symbols, and clothing. Commit violent acts against betrayers and members of rival gangs. ex: Drive-by shootings (even if its a rival's momma's house), fighting, knife-fights, shoot-outs, etc. Also can be vandilists to homes, public places, etc. leaving their gang symbol to "represent" or as a calling-card to a rival.
Crips and tha bloods. 2 of the most violent and feared gangs in America. #1 city they reside in: Los Angeles.