After Roy Albert DeMeo was brought into the Gambino family as an associate, he became the mastermind behind a gang thought to be responsible for up to 200 murders.

Profile of New York gangster Joey Gallo, who was a member of the Colombian crime family, and initiated one of the bloodiest Mob conflicts in history

A group of ruthless Irish punks called the ``Westies'' terrorize Hell's Kitchen in New York City in the the 1970s.

Notorious, heroin kingpin, Leroy "Nicky" Barnes, went from organizing one of the most powerful African-American heroin rings in New York to a government informant. Out of spite, Barnes turned on his fellow associates and destroyed the drug trafficking empire he took so long to build.

Exploring the crimes of Frank Nitti, who ran Al Capone's crime syndicate when the Mob boss was incarcerated

This mobster rose from a foot soldier in Al Capone's Chicago "Outfit" to eventual boss of the notorious gang. Under Tony Accardo's leadership, off-and-on for nearly fifty years, the "Outfit" prospered through numerous illegal rackets including gambling, prostitution and extortion.

This episode explores six of the most notorious mafia killings of all time and the everlasting effects these murders had on organized crime. From the Castellammarese War in the late 1920's to the assassination of the Boss of Bosses, Paul Castellano, in 1985, we'll go deep inside the most infamous mafia power struggles in American history. The program delves into the relationships of greedy, power hungry Mafiosi, exploring their conflicts, and illustrating their bloody resolutions. From Maranzano to Masseria, Dutch Shultz to Bugsy Siegel, the outcome is always the same... murder.