The party was founded on 19 March 1940 by Tridib Chaudhuri and has its roots in the Bengali liberation movement Anushilan Samiti and the Hindustan Socialist Republican Army.[5] A major section of the Anushilan movement had been attracted to Marxism during the 1930s, many of them studying Marxist–Leninist literature whilst serving long jail sentences.The CSP had adopted Marxism in 1936 and their third conference in Faizpur they had formulated a thesis that directed the party to work to transform the Indian National Congress into an anti-imperialist front.[12] During the summer of 1938, a meeting took place between Jayaprakash Narayan (leader of CSP), Jogesh Chandra Chatterjee, Tridib Chaudhuri and Keshav Prasad Sharma.Although the editorial board included several senior CSP leaders like Acharya Narendra Deva, it was essentially an organ of the Anushilan Marxist tendency.Ahead of the session there were fierce political differences between the leftwing Congress president, Subhas Chandra Bose, and the section led by Gandhi.As the risk of world war loomed, Bose wanted to utilise the weakening of the British empire for the sake of Indian independence.But at the same session a proposal was brought forward by Govind Ballabh Pant, through which gave Gandhi veto over the formation of the Congress Working Committee.[18] The Anushilan Marxists shared Bose's view that the relative weakness of the British empire during the war should have been utilised by independence movement.But few days later, at a session of the All India Congress Committee, J.P. Narayan and the other CSP leaders pledged not to start any other movements parallel to those initiated by Gandhi.The Forward Bloc, the Anushilan Marxists (still members of the CSP at the time), the Labour Party and the Kisan Sabha attended the conference.RSP meant that the socialist Soviet Union had to be defended, but that the best way for Indian revolutionaries to do that was to overthrow the colonial rule in their own country.RSP was in sharp opposition to groups like Communist Party of India and the Royist RDP, who meant that antifascists had to support the Allied war effort.A section of its cadres, like N. Sreekandan Nair, Baby John and K. Balakrishnan, joined RSP and built a branch of the party in Kerala.The main faction of the RSP successfully defended its bastion Kollam Loksabha seat in 2019 fielding N. K. Premachandran again despite aggressive campaign by the LDF but suffered huge defeats in the 2016 and 2021 Kerala Legislative Assembly elections, with all its candidates losing.
RSP poster in
Kerala
, honouring historical RSP leader T.K. Divakaran