Bolsheviks – Led by Vladimir Lenin. Believed in discipline, centralisation, organisation, and the role of the proletariat under party guidance. From 1905 favoured a peasant/proletariat alliance.
Socialist Revolutionaries (SR) Favoured populist ideas of redistribution of land and nationalisation. Left of the party favoured terrorism to achieve aims.
Trudovniks (Labour Group) Non-revolutionary breakaway from SR party of moderate liberal views but with no formal programme. Favoured nationalisation of non-peasant land, democratic representation, a minimum wage and an eight hour working day. Supported by peasants and intelligentsia.
Octobrists (Union of 17th of October) A moderate conservative party that accepted the October Manifesto and opposed further concessions to workers or peasants. Supported by wealthy landowners and industrialists