James "Whitey" Bulger is one of Boston's most notorious gangsters, who reigned supreme in Boston's underworld for more than 20 years.

Murder, Inc. is the name for a ruthless gang that carried out mob hits during the 1930s.

He was one of the most successful and notorious members of the Italian-American Mafia.

"Big Paul" Castellano served as boss of the Gambino crime family--the largest in New York during the 1970's and 80's.

The fifth child of 13 children, John Joseph Gotti, Jr. was born October 27, 1940 in the South Bronx. From a very young age, John Gotti made a name for himself.

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.