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June 14- Mafia associate is charged with killing Kansas City police officer James H. "Happy" Smith. [1]
June 26 – Timothy D. "Big Tim" Murphy is gunned down by assassins as he answered the door at his Chicago home.
July 25 – , an associate of Chicago mobster Joe Aiello, is killed outside his home in Chicago.
September 7 – Unione Siciliane President Antonio Lombardo, an advisor to mob boss Al Capone, is killed by several unidentified gunmen.
October 10 – Salvatore "Toto" D'Aquila, founder of the present day Gambino crime family and reportedly held the title of "capo di tutti capi" (or "boss of all bosses"), is shot and killed by unidentified gunmen. He is succeeded by Alfred "Al Mineo" Manfredi.
November 4 – Mob financier Arnold Rothstein is shot by an unidentified gunman while at Manhattan's and dies of his wounds at the Polyclinic Hospital the following day. Rothstein's murder would be attributed to his refusal to pay a $320,000 gambling debt from a three-day poker. Rothstein had refused to pay because he said the game was dishonest. , a participant in the game, would be arrested for Rothstein's murder, but later acquitted due to lack of evidence.
December 5 – In a meeting known as the , over 20 mobsters are arrested while staying at a Cleveland hotel, including Cleveland, Ohio bootlegger and New York bootlegger Vince Mangano. Of those in attendance, future mob boss Joe Profaci and mobster Joseph Magliocco, would attend the 1957 Apalachin Conference in New York.
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