The son of Jewish immigrants, Siegel was raised in the crime-ridden section of Williamsburg, where Irish and Italian gangs were prevalent. As a teenager, he extorted money from pushcart peddlers on New York City’s Lower East Side. In 1918, Siegel befriended fellow hooligan Meyer Lansky, with whom he established the Bugs-Meyer Gang—a band of ruthless Jewish mobsters that ran a group of contract killers under the name Murder, Inc.
During the 1920s, Mafia kingpin Charles “Lucky” Luciano and a number of other Italian gangsters organized themselves into a national syndicate. Nicknamed Bugsy for his volatile nature, Siegel became a prominent player in this newly established group of criminals.With a goal of killing off many of New York’s veteran gangsters, Siegel was one of four hit men hired to execute Sicilian mobster Joe “the Boss” Masseria in 1931.