In the US, a gang injunction is a court-issued restraining order prohibiting gang members from participating in certain activities. It is based on the legal theory that gang activity constitutes a public nuisance that prevents non–gang members from enjoying peace in their communities.
While Los Angeles experimented with gang injunctions in the 1980s, the first gang injunction to make headlines was obtained by Los Angeles City Attorney James Hahn against the West Los Angeles–based Playboys Gansta Crip in 1987. The move was hailed as an innovative way for law enforcement to crack down on gangs, allowing people to regain control of their neighborhoods. In 1993, the Los Angeles City Attorney's office filed for another injunction, this time against 500 members of the Blythe Street Gang of Panorama City. The American Civil Liberties Union joined other groups in opposing the injunction, arguing that it would outlaw such legal activities as carrying on conversations and possessing tools like pocket knives and screwdrivers, and that it would lead to injustices against people whose identity had been mistaken. The injunction was issued despite the efforts against it. It was followed by injunctions in the cities of San Jose, Burbank, San Diego, Westminster, Pasadena, Redondo Beach, Modesto, and Oxnard.