Martin Heidegger's involvement with National Socialism ran far deeper and longer than the philosopher himself admitted, extending well beyond his notorious ten-month tenure as rector of the University of Freiburg. Victor Farias' groundbreaking 1989 work "Heidegger and Nazism" dismantles decades of scholarly assumptions through extensive documentary evidence, tracing Heidegger's anti-Semitic inclinations to his early admiration for the anti-Jewish preacher Abraham a Sancta Clara and his pre-WWI publications in anti-Semitic journals. The evidence reveals Heidegger as an active Nazi Party member until 1945 who secretly denounced colleagues to Nazi officials, systematically transformed Freiburg into a Nazi institution, and steadfastly refused to repudiate his Nazi involvement after the war. Particularly troubling is Hannah Arendt's defense of her former mentor and lover, highlighting a stark moral contradiction between her condemnation of Jewish victims of Nazism and her willingness to excuse Heidegger's active collaboration. These findings fundamentally challenge the moral responsibility of intellectuals who defended or minimized Heidegger's extensive Nazi engagement, forcing a wholesale reevaluation of his philosophical legacy and ethical standing.