At the end of the war, Pollitt joined Sylvia Pankhurst's Workers' Socialist Federation, which became the Communist Party (British Section of the Third International). As a member of this group he joined the Communist Party of Great Britain when it was formed in mid-1920. Pankhurst soon left the party, but Pollitt remained. He was heavily influenced by the Communist intellectual Rajani Palme Dutt and the two remained close allies for many years. From 1924 to 1929 Pollitt was General Secretary of the National Minority Movement, a Communist-led united front within the trade unions.