It is first necessary to establish that Heidegger was a Nazi, a full-blown enthusiast for Hitler. He remained a member of the Nazi party from 1933 to 1945 and never disowned (but did falsely downplay) his Nazism and never apologised for it. And he lied copiously about his involvement to the post war de-Nazification commission, saying for instance that he never used the ‘Sieg Heil’ salutation. This is just one instance of him using it in an address to 600 unemployed workers drafted into the ‘National Socialist labour service’, i.e. slave labour work camps, in January 1934:

“This will … must be our innermost certainty and never-faltering faith. For in what this will wills, we are only following the towering will of our Führer. To be his loyal followers means: to will that the German people shall find again, as a people of labour, its organic unity, its simple dignity, and its true strength; and that, as a state of labour, it shall secure for itself permanence and greatness. To the man of this unprecedented will, to our Führer Adolf Hitler-a three-fold ‘Sieg Heil!” [1]