Approximately 1.4 million people in the United States were part of gangs as of 2011, and more than 33,000 gangs were active in the country. These include national street gangs, local street gangs, prison gangs, outlaw motorcycle clubs, and ethnic and organized crime gangs.

The Crips are an alliance of street gangs that is based in the coastal regions of Southern California. Founded in Los Angeles, California, in 1969, mainly by Raymond Washington and Stanley Williams, the Crips began as an alliance between two autonomous gangs, and developed into a loosely connected network of individual "sets", often engaged in open warfare with one another. Its members have traditionally worn blue clothing since around 1973.