From The Art and Popular Culture Encyclopedia
The relations between Heidegger and Nazism are a controversial subject in philosophy. Some claim that his philosophy is pure from historical and political contingencies. Others, such as Jürgen Habermas or Theodor Adorno, strongly disagree, claiming that his historical engagement for the Nazi party derived from his philosophical conceptions.
When Karl Löwith suggested to Heidegger in 1936 this thesis, the latter responded by the affirmative: "Heidegger agreed with me without reservations and spelled out for me that his concept of 'historicity' was the basis for his political 'engagement'."