In 1937, he headed an independent investigation of an incident in which 18 people were killed and more than 200 wounded in Ponce, Puerto Rico when police fired at them; his commission concluded the police had behaved as a mob and committed a massacre.
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Hays attended the Reichstag trial in Berlin on behalf of Georgi Dimitrov, a Bulgarian Communist accused by the Nazis in 1933 of burning the Reichstag.
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In 1937, Hays was appointed to lead an independent investigation with a group (called the Hays Commission) to study an incident in which 18 people were killed and more than 200 wounded in Ponce, Puerto Rico when police opened fire on them.
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