That Martin Heidegger supported National Socialism has long been common knowledge. Yet the relation between his philosophy and political commitments remains highly contentious. Boldly refuting arguments that the philosopher's political stance was accidental or adopted under coercion, Rockmore argues that Heidegger's thought and his Nazism are inseparably intertwined. Combining extensive documentation of the Heidegger controversy with philosophical and historical analysis, this book raises profound questions about the social and political responsibility of philosophy.