Gus Greenbaum (February 26, 1893 – December 3, 1958) was an American gangster in the casino industry, best known for taking over management of the Flamingo Hotel in Las Vegas after the murder of co-founder Bugsy Siegel.
During Prohibition, Greenbaum began working with the Chicago Outfit managing the southwest division in Phoenix, Arizona of the Trans-America Race wire service in 1928.
He set up in the Luhrs Tower and developed strong relationships with Phoenix leaders even, allegedly, future Senator Barry Goldwater.
[4] Sent to Las Vegas shortly after World War II began, Greenbaum gained control over syndicate gambling operations with Morris Rosen and Moe Sedway.
Shortly after his close friend and Chicago-enemy union organizer Willie Bioff's murder, Greenbaum's worsening gambling, womanizing, and drug habits eventually caused him to begin skimming from casino operations.