Reexamining the case of one of the most famous intellectuals to embrace fascism, this book argues that Martin Heidegger's politics and philosophy of language emerge from a deep affinity for the ethno-nationalist and anti-Semitic politics of the Nazi movement. Himself a product of a conservative milieu, Heidegger did not have to significantly compromise his thinking to adapt it to National Socialism but only to intensify certain themes within it. Tracing the continuity of these themes in his lectures on Greek philosophy, his magnum opus, Being and Time, and the notorious Black Notebooks that have only begun to see the light of day,