The Jewish leftist lawyer Ernst Fraenkel was one of twentieth-century Germany's great intellectuals. During the Weimar Republic he was a shrewd constitutional theorist for the Social Democrats and in post-World War II Germany a respected political scientist who worked to secure West Germany's new democracy. This book homes in on the most dramatic years of Fraenkel's life, when he worked within Nazi Germany actively resisting the regime, both publicly and secretly. As a lawyer, he represented political defendants in court. As a dissident, he worked in the underground. As an intellectual, he wrote his most famous work, The Dual State – a classic account of Nazi law and politics. This first detailed account of Fraenkel's career in Nazi Germany opens up a new view on anti-Nazi resistance – its nature, possibilities, and limits. With grit, daring and imagination, Fraenkel fought for freedom against an increasingly repressive regime.