Willi M nzenberg was a towering figure in the anti-fascist movement during the first half of the twentieth century. He was acquainted with many of the leading left wing activists and thinkers of his day including Lenin, Rosa Luxemburg, Karl Liebknecht, and Karl Radek. He also played a foundational role in several important transnational organisations such as the Socialist Youth International, the largest anti-war movement in opposition to the First...