Gangsters: America's Most Evil

Known as the founder of the notorious Chicago street gang, the Gangster Disciples, Hoover starts one of the first street gangs that was run as a business; while in state prison, Hoover runs a $100 million-a-year drug business.

By the time Perrion is in her 20s, she becomes a drug queenpin, with ties to Mexican drug cartels; in the present day, Perrion's drug trafficking charges are dropped and she now works as a political adviser and fights for prisoners' rights.

Shauntay Henderson was one of the handful of women to appear on the FBI's Most Wanted List; known on the streets as Two Guns, her penchant for fist fighting and high-speed police chases helped contribute to her status as a violent criminal.

A Mexican drug lord and former leader of the Sinaloa cartel, considered by many as one of the most powerful drug traffickers in the world, receives the title of biggest drug lord of all time; the DEA considers him the godfather of the drug world.

After several years of paying his dues in the Beltrán-Leyva cartel, Edgar Villareal climbs to a top position in the enforcement squad called Los Negros, where he employs violent techniques of videotaped torture and decapitation.

Dawud Cool Bey is known as the Philly Intimidator, and he was a key player in the hierarchy in the Kaboni Savage Organization, a drug-trafficking gang led by Kaboni Savage; it is alleged that Bey plotted to kill witnesses; Bey was arrested in 2004.

Young Boys Incorporated was a drug-trafficking gang founded in Detroit in the late '70s, and Milton Butch Jones, Raymond Peoples, and Dwayne Davis rose up the ranks and ran the .. show full overview

Scarfo rose to power during one of the bloodiest periods in Philadelphia organized crime history; more than two dozen mob members or associates were murdered between 1980 and 1985 as Scarfo took control of the Philadelphia mob.

Sam Giancana was a top mob boss; he started out as a driver for Al Capone, and by the Great Depression, Giancana was building his own reputation; Giancana is connected to conspiracy theories involving both the Kennedy family and Fidel Castro.

Spilotro was a soldier for the Chicago Outfit and was assigned to protect the Las Vegas skim: the illegal diversion of casino profits to the Mob; Spilotro's violent extracurricular activities hastened the demise of the Mob's influence in Las Vegas.

Chester Campbell is one of the most notorious figures in Detroit and within the world of organized crime; he served two brief stretches in prison, but he is believed to be connected to more than a dozen murders.

In the Hollywood of the 1970s and '80s, Eddie Nash was a nightclub impresario who used drug trafficking to build a fortune; with ties to the mafia, Nash owned dozens of restaurants.

The '80s are remembered for big hair and neon lights; another popular staple of the decade was cocaine.

Cabrera's criminal history dates back to his youth in the Santa Cruz, Calif., area.