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.

The Utah State Prison houses 4,000 dangerous criminals and violent gangs.

The struggles of prison guard recruits in Wyoming.

Guards use military-like discipline and force to stay in control.

Recruits at the understaffed Wyoming State Penitentiary.

First-time offenders at Iowa's Fort Dodge Correctional Facility.

There's a constant struggle for control inside Alexander Correctional Prison.

The overcrowded Multnomah County Detention Center may be worse than prison.

Stateville Correctional Facility is one of America's most perilous prisons.

A convicted armed robber finds his first 90 days on the outside difficult.

Female offenders jailed in Detroit.

Colorado's Youthful Offender System.

The Maryland Correctional Institution for Women.

Convicted sex offenders at Fremont Correctional in Colorado.

At the Wayne County Jail, officers and counsellors struggle to rehabilitate female offenders, including thieves, drug addicts and prostitutes.

Colorado's Youthful Offender System aims to break down criminal habits and gang mentalities, from first-time convicts to street-savvy veterans.

Criminals in Cleveland, Ohio must pass through the Cuyahoga County Jail.

Inmates in the largest county jail in Denver take advantage of the run down facility.

Brutal gang wars rage inside Bexar County Jail; these are the officers in the middle of the war.