California's Pelican Bay State Prison leads the war on prison gangs.

Ohio's Lebanon Correctional Institution is overfull and behind the times.

Oak Park Heights Supermax controls violent prisoners.

Salinas Valley State Prison in Soledad, Calif.

California's Valley State Prison deals with violent inmates, overcrowding and heavy drug-trade.

One of the newest, high-tech maximum security prisons in the United States.

Nearly 2,200 dangerous and conniving criminals.