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March 7 – Salvatore Sabella, along with and , are acquitted for a 1927 gangland slaying.
May 30 – Sebastiano Domingo aka Buster from Chicago killed in New York City; five others wounded-of whom one died.
June 17 – In an attempt to free bank robber Frank "Jelly" Nash from federal custody, Verne Miller, Charles "Pretty Boy" Floyd, and Adam Richetti, ambush federal agents and local police at the Kansas City Union Station parking lot resulting in the deaths of FBI Agent , Oklahoma, Police Chief Otto Reed, Kansas City Policemen W. J. Grooms and Frank Hermanson, as well as Frank Nash himself. The event would become known as the "Kansas City Massacre".
August 12 – , a gunman for Kansas City mobster John Lazia, is shot and killed by police after murdering lieutenant .
October 9 – Gus Winkler, a gambler and bootlegger on Chicago's West Side (or North Side), is machine gunned to death. Winkler was suspected to have been involved in planning the St. Valentine's Day Massacre.
November 29 – Vernon C. Miller, an associate of New York mobster Louis "Lepke" Buchalter and one of the surviving gunmen of the Kansas City Massacre, is found murdered in Detroit (possibly members of New Jersey mobster Abner Zwillman's organization).
