Overview: Louis Eppolito and Stephen Caracappa, sworn to protect and serve, instead provide their Mafia cohorts with vital confidential information; the dirty c…
Overview: The Harvey Hustlers, a notorious gang, dominates the streets of Harvey, La., for three decades; the gang holds a virtual monopoly over the illegal drug trade in the area and is believed to be responsible for at least 45 homicides.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.
Overview: 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.