Amadeo Bordiga (1899-1970) was an Italian Marxist theoretician, who played a major role in the ideological development of the post-1917 Socialist revolution.

He is well known as one of the last Comintern members to criticize Stalin to his face and live to tell the tale, most notably referred to as "the gravedigger of the revolution" during a 1926 party conference.

In Dialogue with Stalin, Bordiga carefully dissects the economic state of the USSR under Stalin, and lays forward the capitalist nature of the USSR.