Come face to face with some of the most dangerous, deadly and intimidating gangland overlords.

They don’t call them the mean streets for nothing… Cities have long been home to gangs but why are they such a magnet for brutal criminals? Delving into the history and culture of great cities, we find out why these areas have become home to some of the most terrifying gangs in history.

UNDERWORLD: SAN FRANCISCO
When Hong Kong Triads move into San Francisco’s Chinatown, the traditional Chinese underworld collides with modern American gang culture leading to a brutal turf war. With dead bodies piling up, law enforcement struggles to smash their secretive world.

UNDERWORLD: MANHATTAN
In th...