The essay investigates the conspiratorial dimension of Heidegger’s political philosophy and relates it to its notorious adhesion to Nazism. Heidegger, the essay claims, believed in the existence of a metaphysical Jewish conspiracy and reacted to it by concocting his own conspiracy, a series of sibylline texts whose political content would have been manifest after the foreseen defeat of Bonn’s government. The essay also ponders on the reasons for which this dimension of Heidegger’s thought was not only ignored but also frequently dissimulated by his post-WWII commentators, including, and perhaps above all, by those who belonged to leftist ideologies.