March 30, 1961 (Thursday)
- The Single Convention on Narcotic Drugs was signed at New York. The pact entered into force on December 13, 1964, and now applies to 149 nations.
- Died: Armand Robin, 49, French poet and journalist, three days after his arrest following an altercation in a bar.; and former Brigadier General Mengistu Neway, 41, hanged after the unsuccessful coup attempt against the Ethiopian government in December 1960.
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