Law enforcement officials estimate that tens of thousands of gangs are active across the United States, ranging from neighborhood street gangs to prison gangs and large organized criminal networks.

Anyone who has followed the devastating violence in California’s prisons knows that gang rivalries trigger a lot of the bloodshed. So it stood to reason that if the authorities could get members to ...

Law enforcement agencies estimate that tens of thousands of gangs operate across the United States today. These groups range from street gangs and prison gangs to organized criminal networks.

Gangs in America have a long and complicated history, and the term can describe very different kinds of organizations. Some are neighborhood-based street gangs formed around territory and identity, ...