The Chicago underworld was thrown into chaos when Frank Calabrese Jr., son of mobster Frank Calabrese, flipped against his father.

One of the most violent and outrageous characters in mob history, "Mad Sam" DeStefano lived up to his moniker throughout a three-decade reign as a juice loan lender.

For over thirty years, Richard Kuklinski lived a shocking double life: suburban husband and father at home, and brutal contract killer on the streets-a job that give him the nickname "The Ice Man."

With over 30 years as the head of the Colombo crime family, Carmine Persico stands as one of most enduring Godfathers in mafia history.

For over 30 years, Gregory Scarpa lived a charmed triple life: mafia hit man, loving father and husband and secret FBI informant.

Made famous by Martin Scorcese's film Goodfellas, Jimmy "The Gent" Burke was one of the most prolific mob earners in New York history.