This article centers on the early writings of Isaac Breuer (1910–17), arguing that Breuer's radicalization of neo-Kantianism anchors his revolutionary call to politicize Jewish Orthodoxy. Moreover, it contends that neo-Kantianism, which is normally associated with liberal or social-democratic politics, was given a thoroughly antiliberal reading by Breuer that led to an antiliberal Orthodox politics. While the rise of non-Zionist political Orthodoxy is often regarded as an obsolete traditionalism unattuned to the nature of mass politics, Breuer's politicization of Orthodoxy reveals a coherent antiliberal political theory that addresses the aporias of the democratic age. Breuer uses neo-Kantianism to develop an anti-Weberian “science of politics” which attempts to overcome the modern plurality of values by positing Judaism as coercive public morality. Reading Breuer's Jewish writings through the lens of his quarrels with Weber, Stammler, and Cohen, this article explores Breuer's attempt to overcome the association of Kantian morality with liberalism, by legitimizing coercion politically, philosophically, and theologically. This enabled Breuer to criticize apolitical forms of Jewish Orthodoxy, Zionist programs to politicize Judaism, and democratic politics more generally.