Gangsters: America's Most Evil

Salvatore “Sammy the Bull” Gravano is the most notorious turncoat in Mafia history. Once a loyal Underboss for John Gotti in the Gambino Crime Family, Gravano would do anything for his boss. But it would be John Gotti himself that would get the Bull to change his mind.

David Thai was the leader of the Born to Kill gang, a group of ruthless young men who terrorized Chinatown. The gang extorted shop owners too fearful to turn to police, and even started a war with the long-standing gangs in the area. There was only one way to stop the havoc David Thai started, through an informant in his own gang.

The Aryan Brotherhood of Texas, also known as the ABT, was a violent white supremacist gang that boasted thousands of members inside and outside of prison throughout Texas and the U.S. Though formed in prison to protect themselves against other races, most of the gang’s violence outside of prison was inflicted upon its own members who betrayed the gang in any way. The ABT’s mantra is “God forgives, Brothers don’t.” Ultimately, the loyalty the ABT demanded was nowhere to be found, as members helped put the gang right back behind the prison walls where they first formed.

Juan Garcia Abrego was the leader of the Gulf Cartel, one of the most violent and lucrative drug cartels in Mexican history. After aligning with the Cali Cartel of Colombia, Garcia Abrego’s cocaine smuggling empire grew to an estimated $10 billion. Despite his nickname, “The Doll,” Garcia Abrego was brutal in his violence. He was suspected of ordering dozens of killings; victims reportedly included rival drug traffickers and journalists. He spent years on the run from law enforcement, much of it, hiding in plain sight. But his days on the run would be numbered…

Omar Portee, aka OG Mack, watches street gangs operate on the West Coast, then brings the knowledge back home to the Bronx, N.Y.; at Rikers Island, Portee creates the United Blood Nation and watches it spread throughout the East Coast.

The story of Anibal Mustelier, who was one of the most dangerous criminals during the "Cocaine Cowboy" days in Miami.