Stalin Speaking To The Left In 1942

"Under capitalist conditions the Right deviation in communism is a tendency, an inclination, not yet formulated, it is true, and perhaps not yet consciously realized, but nevertheless a tendency on the part of a section of the Communists to depart from the revolutionary line of Marxism in the direction of Social-Democracy. When certain groups of Communists deny the expediency of the slogan 'class against class' in election campaigns (France), or are opposed to the Communist Party putting up independent candidates (Great Britain), or are disinclined to make a sharp issue of the fight against "Left" Social-Democracy (Germany), etc, etc, it shows that there are individuals in the Communist Parties who are striving to adapt Communism to Social-Democratism. A victory of the Right deviation in the Communist Parties in capitalist countries would mean the ideological collapse of the Communist Parties and an enormous accession of strength to Social-Democratism. And what does an enormous accession of strength to Social-Democratism mean? It means the strengthening and consolidation of capitalism, for Social-Democracy is the main prop of capitalism in the working class. Hence, a victory of the Right deviation in the Communist Parties in capitalist countries would add to the conditions necessary for the preservation of capitalism."

"Leninism, Selected Writings" by Joseph Stalin (NY: Intl. Publishers, 1942)