A look at one of the few women to rise up the ranks of the dangerous Cali Cartel, Mery Valencia.

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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.

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.

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.

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.

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.

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.

Historian Will Mega: Contributes narration and insight on Reelz Gangsters Season 6 Episode 6 spotlighting Gangsters Americas Most Evil - Dawud "Cool" Bey: The Philly Intimidator.

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Bowman, as international president of the Outlaws Motorcycle Club, ordered kidnappings, firebombings, assaults and murders. He joined another exclusive club in 1997, the "FBI Ten Most Wanted" list. Bowman was brought to justice with the help of an informant on the inside of the Outlaw brotherhood.

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This episode explores the case of Luis Felipe, also known as "King Blood." From a prison cell, Felipe founded the New York chapter of the Latin Kings street gang. Felipe's own writings would incriminate him as the orchestrator of murders and crimes against his own members. He is now serving a life sentence in solitary confinement.

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.

Louis Eppolito and Stephen Caracappa, sworn to protect and serve, instead provide their Mafia cohorts with vital confidential information; the dirty c…

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.

This episode features the rise and fall of Johnny Eng, one of the most notorious drug traffickers in the history of Manhattan's Chinatown. A one-time informant for the DEA, "Machine Gun Johnny" thought he could snitch on all his rivals to monopolize the heroin trade on the eastern seaboard. The special task force set up by the DEA would chase Eng all the way to Hong Kong. Eventually extradited to the U.S., Eng would hire John Gotti's lawyer to defend him against a prosecutor known as "The Dragon Lady.

Drug trafficker Lisette Lee is profiled.

Christopher Coke was the notorious leader of the international gang, the Shower Posse. His operation transported drugs to major US cities, sold them for massive profits, and purchased weapons on the black market to export back to his native country, Jamaica. "Dudus", as he was known on the streets, used his criminal wealth and prosperity to win the hearts of his community and influence their political affiliations. Such power propelled him from a Kingpin to a political pawn, and when the US attempted to have the beloved gangster extradited, a civil war broke out to protect him.

This episode follows Anthony Shea, one of the most prolific bank and armored truck robbers, and his "no name" gang out of Charlestown, Massachusetts. Responsible for killing two armored truck guards in Hudson, New Hampshire, Shea and his gang garnered the attention of the FBI Bank Robbery Task Force in 1995. Finally captured a year later, they refused to talk, adhering to Charlestown's long running "Code of Silence." Informants would break that code and testify in court to put Shea away for life.

In her early 20s, Thelma met her husband, Jackie Wright, a major player in the Philadelphia drug game. When her husband was murdered, Thelma was faced with a choice: start life over on the straight and narrow or take over the family business. With a taste of success and the lure of easy money, she started transporting cocaine and heroin between Los Angeles and Philadelphia. But life in the game was not what she bargained for.

This episode features Carlos Lehder, Medellin Cartel member and self-proclaimed Nazi. Lehder revolutionized the cocaine business by taking over an island in the Bahamas and using it as a way station between Colombia and the U.S. On Norman's Cay, the Colombian Rambo meets his match in a professor and diving enthusiast named Richard Novak who will stop at nothing to protect his paradise. Lehder is eventually run off the island and resorts to terrorizing authorities in his homeland to stay out of jail. After years on the run, he's extradited to the U.S. and sentenced to life plus 135 years. When he agrees to testify against Panamanian dictator, Manuel Noriega, he disappears into witness protection.

This episode follows the story of Salvador Magluta and Augusto Falcon, a pair of powerboat racers in Miami who allegedly moved more illegal narcotics than just about anyone in the history of the U.S. War on Drugs. Known as Willy and Sal, they were tried for importing more than 2.1 billion tons of cocaine over more than a decade of trafficking. They were acquitted, but then faced charges of jury tampering. The law finally caught up with Willy and Sal. Falcon plead guilty to obstructing justice and received a 20 year sentence while Sal faced a jury and is now serving 195 years in prison.