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

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.

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

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

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

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

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

A profile of Jack Ruby (1911-1967), the man who shot and killed Lee Harvey Oswald two days after the 1963 assassination of John F. Kennedy. Included: a discussion of his possible motives for the murder.

Chicago mob boss Sam Giancana (1908-75) is profiled.

Profiling Louis "Lepke" Buchalter (1897-1944), who became a crime boss in the New York City underworld by controlling the garment industry. He was convicted of murder in 1941 and died in the electric chair.

A profile of Sammy "the Bull" Gravano, the admitted mob underboss who testified against John Gotti, the head of the Gambino crime family in New York City, in the early 1990s.

A profile of Benjamin "Bugsy" Siegel (1906-47) chronicles his rise to fame, including his role in building Las Vegas.

A profile of Teamsters leader Jimmy Hoffa, who disappeared in 1975. Included: remarks by his daughter Barbara Crancer and biographer Arthur Sloane.

The Genovese crime family is the subject.

A profile of Frank Costello includes an interview with Anthony Quinn. Frank Costello sees himself as a businessman, preferring diplomacy to violence.

Joseph Valachi is the first syndicate member to testify against the Cosa Nostra and reveal its inner workings.

Financial wizard Meyer Lansky survives some 50 years in organized crime.

A profile of Al Capone, who was Chicago's gangland kingpin in the '20s but was cut down by the IRS in 1931 and spent eight years in Alcatraz.

Vincent Gigante attempts to convince the world that he is legally insane.

Mafia crime boss Joseph Bonanno outlives enemies and publishes his memoirs.

A profile of New York's Gambino crime family examines the rise of its founder, Carlo Gambino, and that of his successors, Paul Castellano and John Gotti.

Mobster Henry Hill's testimony brings down some of New York's most feared criminals. The mobster-turned-informant Henry Hill, who was portrayed by actor Ray Liotta in the 1990 film "Goodfellas."

A profile of Charles "Lucky" Luciano (1897-1962), a mob figure in 1930s New York. Salvatore "Lucky" Luciano creates Murder Inc. and makes millions in racketeering and prostitution.

Fugitive James "Whitey" Bulger is profiled. He rose to become a gangster in South Boston, became an informant for the FBI to end the Italian mob in, distract them from his own criminal activities and ended in the largest informant scandal in FBI history.

The story of Murder, Inc., a 1930s organized-crime group whose members were mob enforcers. Murder, Inc. was a ruthless gang that carried out an estimate 1,000 mob hits. founded by Meyer Lansky and Benjamin "Bugsy" Siegel, they were assassins that carried out contract killings for the Itailian American, Jewish American mafia, and others