In February 1942, the notorious gangster Benjamin “Bugsy” Siegel went on trial in Los Angeles for the 1939 murder of fellow mobster Harry “Big Greenie” Greenberg. One of the killers, Allie Tannenbaum, agreed to cooperate. However, District Attorney John F. Dockweiler faced a problem. California law demanded corroboration by a second witness. The state had…

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