Immediately after Austria's "anschluss" to the German Reich in March 1938, Heinrich Himmler (Reichsführer-SS and chief of the German Police) and Oswald Pohl (chief of the SS-Administration Office, later SS-Main Administration Office for Economic Affairs) set off for Mauthausen and Gusen in order to inspect the quarries there.
On April 29, 1938, the "Deutsche Erd- und Steinwerke GmbH" (DEST) was founded in Berlin, and Oswald Pohl