The papers form four main sections, Left Opposition, Revolutionary Socialist League, Workers International League and the Revolutionary Communist Party.
Left Opposition includes the activities of the Balham Group, 1932-8, the ILP, and papers on Left Opposition in France and Germany.
Revolutionary Socialist League including Central Committee circulars and minutes, 1940-3, with correspondence between the International Secretariat of the Fourth International and the Revolutionary Socialist League; correspondence with the Workers International League regarding the question of fusion, 1940-3; the Revolutionary Socialist League international documents, including factional activity, c. 1942-3; the Revolutionary Socialist League conference documents, 1943; files regarding international questions, including miscellaneous Russian publications.
Workers International League comprises a file of papers, including draft constitutions, 1938 and 1942.
Revolutionary Communist Party includes a file of papers on redundancy and related issues, 1944-9. The are also some miscellaneous papers including a draft novel by D D Harber and a volume of press cuttings.