This book reflects on the role that the opposition to anti-Semitism has been playing in shaping political philosophy after the Holocaust. Its premise is that in post-Holocaust philosophy anti-Semitism has become a paradigm of evil ideology or politics, a negative Politeia. The analysis proceeds through critical readings in prominent political philosophers, from Adorno, Horkheimer, Jean-Paul Sartre and Hannah Arendt, to Alain Badiou and most recently Jean-Luc Nancy, as well as the debates and contemporary scholarship around them. Through these readings the book develops a critical observation, demonstrating how post-Holocaust philosophy has identified the fundamental, epistemological evil of anti-Semitic thought not in thinking against Jews, but in thinking of Jews. In other words, so the book’s claim, what philosophy has been denouncing as anti-Semitic is the figure of “the Jew” in thought. The book thus reveals how it is paradoxically the opposition to anti-Semitism that has been generating in post-Holocaust philosophy a rejection of Jewish thought. With respect to this rejection, this book makes two claims: first, that in rejecting Jewish thought the opposition to anti-Semitism comes dangerously close to anti-Semitism; second, that at work in this rejection is a problematic understanding of the relations between politics and thought, i.e. a problematic “political epistemology”. It is the critique of this political epistemology, as foundational for contemporary political thought, which is the ultimate aim of the book. The book’s original contribution consists in offering the first systematic analysis of the contemporary philosophical problem of anti-Semitism and the opposition to anti-Semitism. It intervenes in current conversations on the relations between Western philosophy, anti-Semitism and Jewish thought, the relation between politics and truth, and the relations between religion and race, among others in the context of the critiques of orientalism and secularism as well as post-colonial theory.