The Hague Congress of the International Workingmen's Association (September 1872) marked the end of this organization as a unitarian alliance of all socialist factions (Anarchists and Marxists). The Marxist current took control and the anarchist current founded a new International in the subsequent Congress of Saint-Imier, a few days later.

Marx in Amsterdam

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Karl Marx and Friedrich Engels, leaders of the Marxist faction, went to Amsterdam after the congress and had a speech there. There were only a few hundred socialists in the Netherlands. A hundred of them listened to the speech of Marx, but they were not interested. All hundred went upstairs with anarchists who entered the room with a few hundred supporters. Marx and Engels were left alone in the room with nobody left to listen to their speeches, so they left. Hendrik Gerhard, leader of the socialists in Amsterdam visited Marx in his hotel. Later, he angrily told the other socialists that Marx treated him like a gentleman treats his porter. Gerhard said he couldn't understand why Marx needed the 800 pages of Das Kapital to prove that the surplus of the work of a worker goes to the privileged classes, when it could be said in one sentence. It took until 1894 before the marxists got their own organization in the Netherlands.

Congresso dell'Aia (1872)