Donnie Brasco was the alias of Joseph Pistone, an undercover FBI agent that infiltrated the Bonanno crime family.
James "Whitey" Bulger has been on the FBI's Top Ten Most Wanted list since 1999, number two, behind Osama bin Laden.
A child from an Italian immigrant family, Al Capone (a.k.a. 'Scarface') rose to infamy as the leader of the Chicago mafia during the Prohibition era.
Anthony Casso is a member of the Lucchese crime family who was the first major crime boss to be kicked out of the witness protection program.
Paul Castellano is best known for becoming the boss of the Gambino crime family in New York City.
Mickey Cohen became the West Coast racket boss in 1947, after his mentor and predecessor, Bugsy Siegel, was assassinated.
Jack "Legs" Diamond was a Prohibition-era mob leader, hit man and bootlegger who was based in New York.
John Dillinger was an infamous gangster and bank robber during the Great Depression, and was know as "Jackrabbit" and "Public Enemy No. 1."
New York gangster Joey Gallo was both a hero and villain; a very public criminal who hung out with pop stars and was immortalized in the Bob Dylan song, Joey.
Organized crime boss, Sam Giancana climbed to the top of Chicago's underworld and became a player on the national stage through shadowy ties to the Kennedys.
Vincent Gigante was an Italian-American mobster, known as "The Enigma in the Bathrobe," who led the Genovese crime family of New York City.
John Gotti was an organized crime leader who became head of the Gambino family.
Sammy "The Bull" Gravano, a mobster turned government witness, is best known for testifying against his mafia associates in exchange for government protection.
Henry Hill was a member of the Lucchese crime family who became a federal informant, inspiring the Martin Scorsese movie Goodfellas.
By the 1960s, gangster and drug kingpin Frank Lucas had constructed an international drug ring that spanned from New York to South East Asia.
Lucky Luciano was an Italian-born American mobster best known for engineering the structure of modern organized crime in the United States.
Carlos Marcello was best known as the mob boss of New Orleans, and for the FBI's investigation of his possible involvement in JFK's assassination.
Mob boss Nicodemo "Little Nicky" Scarfo controlled Philadelphia's organized crime for many years, even from prison.
Iconic mobster Benjamin "Bugsy" Siegel built the Flamingo casino in Las Vegas, igniting an era of glamour, gambling and gangsters in the desert.
Tony Spilotro is best known as a mob representative in Las Vegas from the 1970s to the '80s. He was brutally beaten and murdered by mob members in 1986.
Santo Trafficante is best known for running casinos in Cuba, prior to Castro's revolution.