Season 4

Gun-for-hire Joe "Mad Dog" Sullivan tries to hide his criminal activities from his family.

Frank Calabrese Jr., son of mobster Frank Calabrese, flipped against his father, and nearly brought down the vaunted Chicago Outfit.

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 and sadistic enforcer with the notorious Chicago Outfit.

Dutch Schultz ruled the numbers rackets until mob bosses ordered his murder.

Richard Kuklinski lived a shocking double life; suburban husband and father at home, and brutal contract killer on the streets.

Carmine Persico stands as one of most enduring Godfathers in mafia history.

Gregory Scarpa lived a charmed triple life; mafia hit man, loving father and husband, and secret FBI informant.

Jimmy Burke was one of the most prolific mob earners in New York history.