 In 1959, Kuroda became the Chairman of the Japan Revolutionary Communist League.He wrote over fifty books published both in Japan and other countries on such subjects as Marxist philosophy, the analysis of Soviet society, Japanese cultural history, theory and praxis of organization building, and contemporary politics.From 1963, Kuroda was the central theoretical figure in the Japan Revolutionary Communist League (Revolutionary Marxist Faction), remaining active in the group until retiring late in life.