The official secret police force of Nazi Germany, the Gestapo, was established.
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The Chernobyl power plant in Ukraine exploded, killing 31 people and spreading contamination across Western Europe.
The Voice, a reality singing competition television show, premiered on NBC.
The first major mass trials of polio vaccines began.
Singer Rod Stewart was robbed at gunpoint.
The Handmaid's Tale debuted on Hulu.
