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.

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."

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.

In the 1980s, New York City cops Louis Eppolito and Stephen Caracappa were secretly working as hired guns for the Mafia in a scheme that would go down as the worst case of police corruption in NYPD history.

Fashioning himself a modern-day Celtic warrior, 1970's Irish mobster Danny Greene clashed with the Cleveland mafia, resulting in a bombing war that would eventually destroy them both.

As leader of Murder, Inc., Albert Anastasia was one of the most vicious and feared mob bosses of the twentieth century.

Tommy Pitera became one of the most violent men of all time in the 1980's; betrayal brought the mob killer to justice.

During the 1970s, Anthony "Gaspipe" Casso rose through the ranks of the New York Mafia to become underboss of the Lucchese family, raking in millions of dollars through elaborate scams and killing anyone who got in his way.

After New York's Bonanno mob family was nearly destroyed by an undercover FBI agent, Joseph "Big Joey" Massino brought them back to prominence and became the only major Mafia boss left on the streets...the "Last Don."

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

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

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

Mickey Cohen became the king of West Coast mob rackets in 1947, following Bugsy Siegel's death.

Women with mob ties are profiled. Recounts the roles female mobsters Virginia Hill, Arlyne Brickman, and Karen Hill all played in their mafia lifestyles.

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

Carlos Marcello grew up in the mysterious milieu of New Orleans in the early 20th Century to become the city's mafia boss for almost four decades. Despite his modest beginnings, Carlos joined the mafia at age 26 and quickly climbed in the ranks, aided by success in illegal gambling ventures and a talent for making effective payoffs to public officials. In 1947, Marcello became the longtime boss of New Orleans in a reign marked by absolute power, corruption, and antagonism of the U.S. government. At his height he would be revered as possibly the most powerful mob leader in the nation. One day Congress would even suspect Marcello of participating in a conspiracy to kill the President to of the United States.

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.

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.