The theory of "defeating" opportunist elements by the ideological struggle within the Party, the theory of "overcoming" these elements within the con… - Joseph Stalin

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The theory of "defeating" opportunist elements by the ideological struggle within the Party, the theory of "overcoming" these elements within the confines of a single party, is a rotten and dangerous theory, which threatens to condemn the Party to paralysis and chronic infirmity, threatens to leave the Party a prey to opportunism, threatens to leave the proletariat without a revolutionary party, threatens to deprive the proletariat of its main weapon in the fight against imperialism. Our Party could not have emerged on to the broad highway, it could not have seized power and organised the dictatorship of the proletariat, it could not have emerged victorious from the civil war, if it had had within its ranks people like Martov and Dan, Potresov and Axelrod. Our Party succeeded in achieving internal unity and unexampled cohesion of its ranks primarily because it was able to in good time to purge itself of the opportunist pollution, because it was able to rid its ranks of the Liquidators and Mensheviks. Proletarian parties develop and become strong by purging themselves of opportunists and reformists, social-imperialists and social-chauvinists, social-patriots and social-pacifists.