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The Nazis established killing centers for efficient mass murder killing about 2,200,000 Jews with poison gas

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First killing center in Chelmo in Poland December 1941.Jews and some Roma were gassed in mobile gas vans

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1943 in Poland Nazis opened Belzec Savibor and Treblinka (Operation Reinhard Camps)

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March 1942 and November 1943 1,526,500 Jews were killed

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Small numbers of people were chosen for a special work force Sonderkommandos (cleaned up the dead bodies from gas chambers and camouflaged them

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Largest center was Auschwitz-Birkenau with four gas chambers by 1943.

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By November 1944 million of Jews and tens of thousands of Roma,Poles,and Soviet prisoners were killed.

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Madjdanek primarily served to concetrate Jews and sometimes served as a killing center