Communist League of America (Opposition)

The Communist League of America (Opposition) was founded by James P. Cannon, Max Shachtman and Martin Abern late in 1928 after their expulsion from the Communist Party USA for Trotskyism. The CLA(O) was the United States section of Leon Trotsky's International Left Opposition and initially positioned itself as not a rival party to the CPUSA but as a faction of it and the Comintern. The group was terminated in 1934 when it merged with the American Workers Party headed by A. J. Muste to establish the Workers Party of the United States.