Claim: John Factor (October 8, 1892-January 22, 1984) was a Prohibition-era gangster and con artist affiliated with the Chicago Outfit who spent ten years in federal prison for stock fraud (United Kingdom) and mail fraud (U.S.).
Evidence: John Factor (October 8, 1892 – January 22, 1984), born Iakov Faktorowicz, was a Prohibition-era gangster and con artist affiliated with the Chicago Outfit. 10 years in federal prison (U.S.) Stock fraud (United Kingdom);
Mail fraud (U.S.)