"The Communists do not form a separate party opposed to other working-class parties. They have no interests separate and apart from those of the proletariat as a whole. They do not set up any sectarian principles of their own by which to shape and mould the proletarian movement... The Communists are, practically, the most advanced and resolute section of the working-class parties of every country, that section which pushes forward all others; on the other hand, theoretically, they have over the great mass of the proletariat the advantage of clearly understanding the line of march, the conditions and the ultimate general results of the proletarian movement." Marx and Engels, Communist Manifesto