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A concentration camp near Oswiecim in Poland is constructed by the SS, Hitler's Secret Police.
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30 "criminals" arrived at Auschwitz from a concentration camp in Germany, Sachsenhausen.
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Heinrich Himmler inspected Auschwitz, and ordered expansion of Auschwitz facilities. He was concerned for prisoner capacity, so he wantd to help Auschwitz I out by building of a camp near Birkenau, which is come to be known as Auschwitz II-Birkenau.
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Auschwitz I SS officers test out Zyklon B gas by killing 600 Soviet POW and 250 other weak prisoners. Zyklon B was the generic name for crystalline hydrogen cyanide gas.
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SS and Police authorities deport more than 585,000 Jews to Auschwitz.
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Soviet troops enter the Auschwitz camp complex and liberate approximately 7,000 prisoners remaining in the camp. During the existence of Auschwitz, the SS camp authorities killed nearly one million Jews from across Europe.