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According to Hanns and Rudolf by Thomas Harding near the end of WW2 the allies created a large database ... known as CROWCASS, of war criminals which they intended to target once victory was achieved.

Rudolf Hoess was listed with his name spelt slightly wrong, and his age and other details slightly off. However the list did identify him correctly as commandant at Auschwitz.

How easy would it have been for allied agents in in Berlin to obtain this kind of information? Were Nazi "H.R." type records within allied reach - via spies - during the war? Presumably Auschwitz was a fairly secret project and you couldn't just thumb a public directory or follow the news in order to learn the personal details of Auschwitz's commandant.

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There was lots of spying and surveillance being done by the military, producing copious amounts of often quite mundane data that was then analyzed for its military usefulness. All it took was to make it someone's job to look through that same data for evidence of war crimes.

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For example, Ultra –  American Luke May 25 at 19:51

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