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Danny Greene was a notorious underworld figure, union boss, embezzler, Mafia enforcer, and an FBI informant; he started a war with the Cleveland Mafia, playing with fire until his Irish luck ran out.

Gangsters: America's Most Evil

Danny Greene

The Johnston Gang was a family affair, consisting of Bruce Johnston Sr. and his brothers David and Norman Johnston; the gang terrorized the Mason-Dixon Line throughout the 1970s, burglarizing and intimidating victims.

Bruce Johnston

Anibal Mustelier was considered amongst the most dangerous criminals of the Cocaine Cowboy days in Miami; suspected of multiple assassinations and the mastermind behind elaborate bank and jewelry heists.

The Ghost: Anibal Mustelier

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.

OG Mack

Juan García Ábrego's cocaine smuggling empire grows to an estimated $10 billion; despite his nickname, The Doll, García Ábrego has a reputation for brutality and is suspected of ordering dozens of killings.

Juan Garcia Abrego

The Aryan Brotherhood of Texas is a white supremacist gang that boasted thousands of members inside and outside of prison throughout Texas and the United States; most of the gang's violence outside of prison is inflicted upon its own members.

Aryan Brotherhood of Texas

David Thai is the leader of the Born to Kill gang, a group of ruthless young men who terrorize Chinatown in New York City; the gang extorts shop owners who are too fearful to turn to police and start a war with rival gangs.

David Thai

Salvatore "Sammy the Bull" Gravano, the most notorious turncoat in mafia history, pledges loyalty to John Gotti until Gotti himself gets the Bull to change his mind.

Sammy the Bull

Head of the Montreal Mafia, Vito Rizzuto oversees a multi-million dollar international empire reportedly fueled by drug trafficking, money laundering and construction fraud; hard to take down, one act will come back to haunt the Canadian Teflon Don.

Vito Rizzuto

Profiling Kaboni Savage, a ruthless drug dealer and murderer; Savage commits murder to protect his interests, even against his rivals' families; Savage's own words ultimately seal his fate.

Kaboni Savage

John Gotti was the last of the classic gangsters in New York City; unlike other mafia chiefs, he loved attention; he ran a multi-million dollar illegal operation that thrived on prostitution, extortion, gambling, theft and drugs.

John Gotti

Richard Kuklinski, one of the most notorious killers in American history, becomes convicted of the murders of four people, but likely killed dozens more; initially a hit man for the Mafia, Kuklinski eventually carries out hits of his own.

Richard "Iceman" Kuklinski

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S5 E9 | Aryan Brotherhood of Texas

E14 | Danny Greene

E13 | Bruce Johnston

E12 | The Ghost: Anibal Mustelier

E11 | OG Mack

E10 | Juan Garcia Abrego

E9 | Aryan Brotherhood of Texas

E8 | David Thai

E7 | Sammy the Bull

E6 | Vito Rizzuto

E5 | Kaboni Savage

E4 | John Gotti

E3 | Richard "Iceman" Kuklinski