sentences:  Along with Cornélissen, he cited as example US trade-unions, where trade-unions composed of qualified workers sometimes worked in opposition to non-qualified workers in order to defend their relatively privileged position.According to Malatesta, anarchists had to also defend this "Lumpenproletariat" instead of only working for the improvement of labor conditions.Malatesta underlined divisions of interests inside the workers' movement itself, going so far as to criticize the notion of social class