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In the Nuremberg judgment, for instance, the policy to force non-Jewish foreign workers into slave labour was considered a central part of the attack against the civilian population in countries occupied by Nazi Germany.
Judgment of the International Military Tribunal, The Trial of German Major War Criminals, Proceedings of the International Military Tribunal sitting at Nuremberg, Germany, Vol.1 (1946), pp. 460 ff. In coming to this conclusion, the Nuremberg judgment took into account statements of Heinrich Himmler, one of the main architects of the slave labour policy, which indicated that the objective of the policy was to boost the German war effort, but was driven by awareness and acceptance that inhumane acts were being committed in pursuing this objective. See
Judgment of the International Military Tribunal, pp. 460 and 463.