the London Bureau of left-wing socialist parties. Sometimes called the "Three-and-a-Half International", it involved many of the same parties. See also Democratic socialism References Further reading André Donneur: Histoire de l’Union des partis socialistes pour l’action internationale (1920-1923). Sudbury Ontario: Libr. de l’Université Laurentienne, 1967. Lenin "The restoration of the International" Trotskyism versus Centrism in Britain External links Archive of the International Working Union of Socialist Parties A Communist view on the Conference of the Three Internationals The Second and Third Internationals and the Vienna Union The proceedings of the Berlin conference Socialism History of socialism Left-wing internationals Political parties established in 1921 1923 disestablishments