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The use of forced labour and slavery in Nazi Germany and throughout German-occupied Europe during World War II took place on an unprecedented scale.[2] It was a vital part of the German economic exploitation of conquered territories. It also contributed to the mass extermination of populations in German-occupied Europe. The Nazi Germans abducted approximately 12 million people from almost twenty European countries; about two thirds came from Central Europe and Eastern Europe.[1] Many workers died as a result of their living conditions ñ extreme mistreatment, severe malnutrition, and worse tortures were the main causes of death. Many more became civilian casualties from enemy (Allied) bombing and shelling of their workplaces throughout the war.[3] At its peak the forced labourers comprised 20% of the German work force. Counting deaths and turnover, about 15 million men and women were forced labourers at one point during the war.

https://en.wikipedia.org/wiki/Forced_labour_under_German_rule_during_World_War_II