London: George Allen & Unwin, 1920. First Edition. Octavo. Red cloth boards; dustjacket; 224pp. Includes bibliography. Ownership signature to front endpaper (David Stamelman) dated 1937, else a tight, Near Fine copy, free of markings or wear. In the original printed dustwrapper, darkened on spine panel but otherwise quite sharp; Very Good or better. Comparative analysis of the British Labour Party and the left opposition, as represented by the Communist Party of Great Britain and its related radical organizations.