"How Gangs Took Over Prisons"

"Most of the inmates belong to one of California’s six main prison gangs: Nuestra Familia, the Mexican Mafia, the Aryan Brotherhood, the Black Guerrilla Family, the Northern Structure, or the Nazi Lowriders (the last two are offshoots of Nuestra Familia and the Aryan Brotherhood, respectively). The inmates interact like volatile chemicals: if you open their cells in such a way as to put, say, a lone member of Nuestra Familia in a crowd of Mexican Mafia, the mix can explode violently. So the guards release them in a careful order." -- Graeme Wood, "How Gangs Took Over Prisons," The Atlantic, October, 2014