The documents in this volume comprise the record of a fundamental and crucial chapter in the history of the struggle for Trotskyism in the United States - the fight against the renegade, Tim Wohlforth. At issue in this struggle, waged by the Workers League in solidarity with the International Committee of the Fourth International, was the defense of the revolutionary party of the working class - its traditions, history, principles, organizational security, and, at the most essential level of theory, the dialectical materialist method that is the foundation of cadre-training. The publication of this volume is testimony to the fact that the lessons of the struggle against Wohlforth, despite the passage of ten years, have lost none of their political urgency. On the contrary, it is now more clear than ever that the issues raised by Wohlforth's desertion from the Workers League in September 1974 were profoundly related to the development of a new stage in the world capitalist crisis and the most fundamental political, theoretical and historical questions confronting the Trotskyist movement on a world scale.