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Owney Madden, a mob leader and speakeasy owner, leaves New York City. Madden's departure follows several years of police surveillance after the shooting death of renegade mobster Vincent "Mad Dog" Coll. Madden later settles in Hot Springs, Arkansas, establishing gambling operations there and forming political attachments through his hotel operation.
Gunman Joseph "Joey Doves" Aiuppa joins the Chicago Outfit to help protect their criminal operations in Cicero, Illinois.
January 30 – Frank Milano, former boss of the Cleveland crime syndicate, flees the United States for Mexico. Milano is succeeded by Alfred "Big Al" Polizzi.
April – member is convicted of the 1934 kidnap-murder of Philadelphia racketeer . Tri-State Gang leaders and had previously been convicted of murder and executed in Richmond, Virginia in February.
July 16 – "Lupo the Wolf" Ignazio Saietta is charged with extortion. Saietta had been intimidating Italian bakers into joining a local New York labor union he controlled.
August 22 – , Sicilian mafiosi and associate of former "boss of all bosses" Salvatore Maranzano, is gunned down. Troia was reportedly conspiring to assume control of the Newark-based New Jersey crime syndicate.
September 9 – Abraham Weinberg, a lieutenant of Dutch Schultz, disappears and is presumed murdered. Weinberg had been running Shultz's organization since Shultz went into hiding in 1933. Reportedly, Weinberg had been secretly negotiating with syndicate leaders Charles Luciano and Louis Buchalter. Schultz may have murdered Weinberg after returning to power.
October 23 – , premier enforcer and lieutenant of Dutch Schultz's policy operations in Harlem, is severely wounded by rival gunmen. This attack comes just hours after Schultz and his other associates are gunned down in Newark. Krompier ultimately survives the attack.