The Mafia With Trevor McDonald

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.

Joey Gallo rises from the slums of Brooklyn to take on the biggest mafia dons of the 1950s and 1960s.

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

Heroin kingpin Leroy "Nicky" Barnes turns government informant, destroying the drug trafficking empire he took so long to build.

Frank Nitti joined Al Capone's criminal empire in 1920, rising quickly in the organization; in 1933, Frank caught his big break when Capone went to prison for tax evasion, and Nitti took over his criminal enterprise.

Six of the most notorious mafia killings of all time and the effects they had on organized crime.