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Their relationship was strengthened as a consequence of the revolution , in which China was criticized greatly for its revisionism and personal cult practiced by Chairman Mao Zedong and his associates . The questions of whether revolution should be upheld or opposed and whether the dictatorship of the proletariat should be upheld or opposed have always been the focus of struggle between Marxism - Leninism and all brands of revisionism and are now the focus of struggle between Marxist-Leninists the world over and the revisionist Khrushchov clique . " Lenin , Mao Tse-tung , and other revolutionary documents from the many Maoist-inspired struggles against revisionism and imperialism ... " The gathering , entitled " Revisionism and Zionism , " was organized under the auspices of the California-based group which denies the historic veracity of the Nazi Holocaust and was being coordinated by Jurgen Graf , a convicted Swiss extremist who fled to Tehran after being sentenced to jail for Holocaust denial .