The size of the Communist Party of Great Britain (CPGB) belied its influence; many saw it as a microcosm of the communist-capitalist struggle. It had a powerful presence in British society despite being a minority movement. Based upon newly available sources, Neil Redfern re-examines the movement and its relationship to imperialism. He traces the history of British communism from its gradualist roots and finds that, despite World War I, the 1917 revolution and mass movements in Asia, Africa and Latin America, CPGB remained Euro-centred and reformist rather than revolutionary, even supporting the post-1945 Labour government.