Born in Gräfenhainichen, Saxony-Anhalt, Ohnesorge started working for the Imperial Post in 1890.
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Like Stuckart, who held the real power in the Interior Ministry (officially led by Wilhelm Frick) and Wilhelm Ohnesorge in the Reichspostministry (officially led by the conservative Paul Freiherr von Eltz-Rübenach), Backe was the de facto Minister of Agriculture under Richard Walther Darré, even before his promotion to that post.