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Cleveland Black Hand leader Rosario Borgio and three others are convicted of the murder of several Akron police officers and executed.
Al Capone leaves New York, after an altercation with a member of the White Hand Gang, going to Chicago, where he becomes a top lieutenant to Johnny Torrio.
Recently imprisoned criminal Joe Valachi encounters inmate and future mentor New York mobster Alessandro Vollero.
Salvatore Sabella becomes leader of the Philadelphia crime syndicate.
Frank Costello forms a novelty company which makes Kewpie dolls in punchboard games. By the following year Costello had made $80,000 ($1.2 million today), which he used to become a bootlegger at the start of Prohibition.
July 29 – New York labor slugger Johnny Spanish is killed by three unidentified gunman possibly including rival gangster Nathan Kaplan.
