“At any rate we may be sure that the political instinct of our bourgeois opponents, as soon as their class interests come into play, will lead them to take a position hostile to us. A classical example is furnished by Belgium, where, as already remarked, a compromise was concluded under the most favorable circumstances conceivable, between the socialists and the liberals. Our party was in undisputed possession of the leadership and was therefore in no danger of being cheated out of the fruits of the common victory. The end sought was universal, equal and direct suffrage. But the clerical party knows its boys, knows its Pappenheimers. It knows that the bourgeoisie has no class interest in giving the laborers, who, in modern industrial states, constitute a majority of the population, the universal suffrage and thereby the prospect of winning a majority and getting political supremacy. It made a counter demand for proportional representation with plural voting, that is, giving more votes to the rich, and thereby granting to the radical bourgeoisie a share in the government, if it would assist in defeating universal and direct suffrage. And behold, without a minute’s hesitation the gentlemen of the radical bourgeoisie broke their agreement with the socialists and joined the clericals in their fight against universal suffrage and the social democracy. Whoever is not convinced by this example that the emancipation struggle of the proletariat is a class struggle is one on whom further arguments would be wasted.”

No Compromise – No Political Trading (1899)