The Dutch-German Communist Left, represented by the German KAPD-AAUD, the Dutch KAPN and the Bulgarian Communist Workers Party, separated from the Comintern (1921) on questions like electoralism, trade-unionism, united fronts, the one-party state and anti-proletarian violence. It attracted the ire of Lenin, who wrote his Left Wing Communism, An Infantile Disorder against the Linkskommunismus, while Herman Gorter wrote a famous response in his pamphlet Reply to Lenin. The present volume provides the most substantial history to date of this tendency in the twentieth-century...