The Marxist Group was an early Trotskyist group in the United Kingdom. Its origins lay in the Communist League, the first Trotskyist group in the country. Trotsky advised the group to enter the Independent Labour Party (ILP), which had just disaffiliated from the Labour Party. He believed that the group should work for a "Bolshevik transformation of the party". Outside the ILP, the Group began working with the Marxist League, another Trotskyist group, and in early 1938, the two joined to form the Revolutionary Socialist League.