"The Communists fight for the attainment of the immediate aims, for the enforcement of the momentary interests of the working class; but in the movement of the present, they also represent and take care of the future of that movement. In France, the Communists ally with the Social-Democrats against the conservative and radical bourgeoisie, reserving, however, the right to take up a critical position in regard to phases and illusions traditionally handed down from the great Revolution.
In Switzerland, they support the Radicals, without losing sight of the fact that this party consists of antagonistic elements, partly of Democratic Socialists, in the French sense, partly of radical bourgeois.
In Poland, they support the party that insists on an agrarian revolution as the prime condition for national emancipation, that party which fomented the insurrection of Cracow in 1846.
In Germany, they fight with the bourgeoisie whenever it acts in a revolutionary way, against the absolute monarchy, the feudal squirearchy, and the petty bourgeoisie."
- —Karl Marx and Friedrich Engels, Manifesto of the Communist Party, English edition of 1888