Some criminal organizations are active both on the streets and behind prison walls. In fact, some gangs were actually born in prison and have grown into powerful criminal organizations. Often well organized, structured, and with strategic alliances in place, a number of prison gangs dominate the world from behind bars. Most of them exert control through violence and intimidation, and are extremely dangerous.
In this gallery, we list some of the most notorious gangs in the world. Click to meet them.