2. The Sinaloa Cartel: The El Chapo Years

Sinaloa and its leader El Chapo aim to become the world's largest drug trafficking organization, but their success is threatened by the Tijuana Cartel, and US and Mexican authorities.

3. The Medellin Cartel

The Medellin Cartel becomes the most powerful cocaine traffickers in the world, but when they go to war with Colombia the cartel tests their limits.

4. Hells Angels: The Sonny Barger Years

Sonny Barger's Hells Angels creates the bloodstained blueprint for all outlaw biker clubs that follow, but can they outwit the feds.

5. The Mongols MC

The Mongols Motorcycle Club's enemies, the Hells Angels and the authorities, threaten the existence of this outlaw motorcycle gang.

6. The Winter Hill Gang

Whitey Bulger's notoriously violent and untouchable Winter Hill Gang are the kings of Boston's underworld, until a secret alliance comes to light.

7. The Chicago Outfit: The Capone Years

The Chicago Outfit takes over the Windy City, even if it means Al Capone's downfall.

8. The Aryan Brotherhood

America's deadliest prison gang, the Aryan Brotherhood, goes to war with anyone who stands in their way.

9. The Bloods

The Bloods will stop at nothing to fight back against their arch-nemesis, the Crips, making national headlines in the process.

10. MS-13

After Los Angeles-based MS-13 members are deported back to El Salvador, the now worldwide vicious group attempts to take over U.S. suburbs, but the authorities fight back.

11. The Rollin' 60s Neighborhood Crips

The Rollin' 60s Crips attempt to become the dominant street gang in Los Angeles regardless of the cost.

12. The Cleveland Mafia

After the Cleveland Mafia bets big on Vegas, the city of Cleveland goes up in flames when their boss suddenly dies.