Ray Challinor (1929 – 2011) was a distinguished Marxist historian of the British labour movement, particularly in the North East of England. Initially a member of the Independent Labour Party, he was an early member of the Revolutionary Communist Party and then the Socialist Review Group and was also a member of the group which succeeded it, the International Socialists. For a period in the 1960s he was a councillor in Newcastle-under-Lyme on the Labour Party ticket in which party IS was then resident, later writing an article in International Socialism on how the experience was politically dispiriting. Born in Stoke-on-Trent, and a conscientious objector, working on the land, after the Second World War, Challinor was educated at Keele and Lancaster Universities and became principal lecturer in history at Newcastle Polytechnic. While a member of the Socialist Workers Party, he wrote his best known work, a classic history of the Socialist Labour Party, The Origins of British Bolshevism (1977).