... fails to take into account the distinctive sources and premises of the Left Opposition in comparison with the Communist Party's Leninist and Stalinist leadership. Between 1923 and 1927, the Left Opposition tried to change the direction of Russia's national policy, which it accused of ruining the goals...

...During the mid-1920s, the Soviet Union saw the eruption of a running controversy between the leadership of the Communist Party and the movements of protest collectively known as the Left Opposition. These opposition movements occupy a central place in the evolution of Stalinist Communism...