Several thousand North Korean migrant workers in Helong engaged in civil unrest, including a factory occupation and the taking of managers as hostages, due to unpaid wages.
After Chicago police detective Jon Burge was discovered to have extracted forced confessions from more than 200 suspects, the governor of Illinois commuted the death sentences of 167 prisoners and pardoned four others.
In a landmark report (cover pictured), U.S. surgeon general Luther Terry issued a warning that tobacco smoking may be hazardous to health, concluding that it has a causative role in lung cancer, chronic bronchitis, and other illnesses.
Italian-American journalist and trade-union activist Carlo Tresca, a leading public opponent of the Mafia infiltration of unions, was assassinated in New York City.
Louis B. Mayer, head of Metro-Goldwyn-Mayer, hosted 36 people involved in the film industry at a banquet, where he announced the creation of what would become the Academy of Motion Picture Arts and Sciences.