Malatesta's arguments against the doctrine of revolutionary unions known as anarcho-syndicalism were later developed in a series of articles, where he wrote that "I am against syndicalism, both as a doctrine and a practice, because it strikes me as a hybrid creature." Despite their drawbacks, he advocated activity in the trade unions, both because they were necessary for the organization and self-defense of workers under a capitalist state regime, and as a way of reaching broader masses. Anarchists should have discussion groups in unions, as in factories, barracks and schools, but "anarchists should not want the unions to be anarchist."