New York and California gangster who was the U.S. crime syndicate's initial developer of Las Vegas gambling.

Young Siegel began his career extorting money from Jewish pushcart peddlers on New York's Lower East Side; he then teamed up with Meyer Lansky (Lansky, Meyer) about 1918 and took to car theft and later bootlegging and gambling rackets in New York, New Jersey, and Philadelphia; he and Lansky also ran a murder-for-hire operation, the forerunner of Murder, Inc. In 1931 he was one of the four executioners of Joe “the Boss” Masseria.

In 1937 the syndicate leaders sent him to the West Coast to develop rackets there. In California the handsome gangster successfully developed gambling dens, gambling ships (offshore beyond the 12-mile limit), narcotics smuggling, blackmail, and other illegal enterprises and equally successfully cultivated the company and friendship of Hollywood stars and celebrities. He developed a nationwide bookmakers' wire service and in 1945 began realizing his dream of a gambling oasis in the desert northeast of Los Angeles. In that year he built the Flamingo Hotel and Casino in Las Vegas, Nev., originally budgeted at $1,500,000 but costing eventually $6,000,000, much of it in syndicate funds from the East. The cost overruns involved extensive “skimming” by Siegel, who had his girlfriend Virginia Hill deposit the money in European banks; he also began writing bad checks to cover construction costs. Such actions and other duplicities angered Lansky and other eastern bosses. In the late evening of June 20, 1947, Siegel was killed in his palatial Beverly Hills home, brought down by a fusillade of bullets fired through his living-room window. At almost the same moment, three of Lansky's henchmen walked into the Flamingo Hotel in Las Vegas and declared that they were taking over.