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Cleveland, Ohio sportsman Arthur B. "Mickey" McBride, the one time leader of the Mayfield Road Mob in Cleveland, purchases the racing wire service from Moses Annenberg.
The three year gang war between the Philadelphia crime family and the rival Lanzetti Brothers ends after the death of leader . The remaining Lanzetti gang members leave the city soon after.
January 28 – Louis Cohen and Isadore Friedman, witnesses scheduled to testify against Louis "Lepke" Buchalter, are murdered in New York City.
January 29 – George Weinberg, a numbers runner for Dutch Schultz, commits suicide while under police protection shortly before his scheduled testimony against Schultz.
August 24 – Louis Buchalter, leader of Murder, Inc., turns himself in to federal authorities, where he arranges a plea bargain with Walter Winchell. However, he is later indicted by New York District Attorney Thomas Dewey and extradited to New York where he is charged and later executed for murder.
October 20 – Charles Carrollo, head of the Kansas City crime syndicate, is convicted of violating federal tax laws and imprisoned in Leavenworth Federal Penitentiary in Leavenworth, Kansas. He is reportedly succeeded by Charles Binaggio.
November 16 – Due to ill health, Al Capone is granted an early released from Alcatraz, and committed to a hospital for treatment of paresis.
