On this day, 21 March 1937, the Ponce massacre occurred when police killed 19 people on a peaceful demonstration and wounded hundreds in Puerto Rico. They were marching for the release of imprisoned separatist leader Albizu Campos. Police acted on the orders of the US-appointed governors, and after the murders staged photos with a press photographer to try to claim self defence.
More information, sources and map: https://stories.workingclasshistory.com/article/9409/ponce-massacre
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