1930 in law
March 31 - The Motion Pictures Production Code is instituted, imposing strict guidelines on the treatment of sex, crime, religion and violence in motion pictures for the next forty years.
April 22 - The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding.
June 17 - U.S. President Herbert Hoover signs the Smoot-Hawley Tariff Act into law.
June 17 - Bonus Army: Around a thousand World War I veterans mass at the United States Capitol as the U.S. Senate considers a bill that would give them certain benefits.
December 2 - Great Depression: US President Herbert Hoover goes before Congress and asks for a US$150 million public works program to help generate jobs and stimulate the economy.
British White Paper demands restrictions on Jewish immigration into Palestine.
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