Orthodox Trotskyism, so called by both adherents and detractors, is a political current within the broader Trotskyist movement that bases itself on the work of Leon Trotsky and his associates, such as James P. Cannon, who advanced Marxist theory in the direction indicated by Trotsky's work, in opposition to the revisionist theories of Pablo, Shachtman, Cliff and others. Orthodox Trotskyists emphasise the analysis, first outlined by Trotsky, of the Soviet Union as a degenerated workers' state, of the Stalinist bureaucracy as a contradictory stratum, and of the present epoch of the class struggle as being characterised by a deep crisis of leadership that can only be resolved by forging, on a firm basis, a Fourth International of revolutionary Bolsheviks-Leninists. This group is for adherents to the orthodox Trotskyist line, and every comrade who is interested in orthodox Trotskyist theory.