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by Rudolf Vrba

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About the author

Rudolf Vrba (born Walter Rosenberg) was a Slovak-Jewish biochemist who, as a teenager in 1942, was deported to the Auschwitz concentration camp in German-occupied Poland. He became known for having escaped from the camp in April 1944, at the height of the Holocaust, and for having co-written a detailed report about the mass murder that was taking place there.
(Wikipedia)