Germany’s National Socialist (Nazi) government and Switzerland had substantial ties. Switzerland’s contribution to the construction of the Dachau concentration camp near Munich is not well known.
Before WWII, Extroc, SA, a Swiss state-subsidized timber company built the Dachau concentration camp, under a contract for 13 million Swiss francs. The contract was negotiated by Colonel Henri Guisan, the son of the later Swiss Commander-in-Chief Henri Guisan (1874–1960) and a Swiss national hero. The Swiss Colonel was in turn connected to Hans Wilhelm Eggen, an SS captain who bought timber in Switzerland for the Waffen SS. This was the wood used to construct Dachau. Dachau was the first regular concentration camp established by the Nazi government.
According to a now declassified CIA report, Eggen often went to “Switzerland under cover of a delivery agent for wooden barracks.” Eggen was a friend of Heinrich Himmler, Reichsführer of the SS. In Nazi Germany, the SS controlled the German police forces and the concentration camp system.
See, Roberts, Andrew, The Storm of War (p. 113). HarperCollins e-books. Kindle Edition; Goñi, Uki, The Real Odessa: How Perón Brought the Nazi War Criminals to Argentina (p. 170). Granta Books. Kindle Edition.