6. Mexican Mafia
3The #6 on our list of the biggest gangs in America operates inside and outside California federal and state prisons. This is the oldest and most powerful prison gang in the States. The beginning of the 1960s was the period when the Mafia was formed and started “doing business” of vulgar beatings, trafficking, extortion, and kidnapping. More than 34,000 gangsters throughout the United States are involved with this gang.
