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In 1937, Hermann Göring transferred to Pleiger the management of the "Reichswerke AG für Erzbergbau und Eisenhütten "Hermann Göring"", commonly known as the "Reichswerke Hermann GörIng", an industrial establishment dealing in ore mining and iron, which was huge but unprofitable, but nevertheless deemed necessary to further Germany's growth and power. In 1941, Pleiger became Reich commissioner for Nazi Germany's coal supply, and in 1942 "Reich Commissioner for the Whole Economy of the East".