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After the beginning of the war between Nazi Germany and the Soviet Union in 1941 a campaign of mass murder , conducted by the Einsatzgruppen , culminated from 1942 to 1945 in systematic genocide : the Holocaust .
 Nazi Germany, Soviet Union, Einsatzgruppen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nazi Germany, Soviet Union, Einsatzgruppen