We have learned with great pleasure from your letter of the 2nd inst that your Spanish translation of Marx s Mis re de la Philosophie  is about to be published. Of course we readily approve of this enterprise. It will certainly have a most favourable effect on the development of socialism in Spain. The Proudhonian theory, whose foundations were demolished by Marx s book, disappeared from the scene after the fall of the Paris Commune. But it is still the great arsenal from which the middle-class radicals and pseudo-socialists of Western Europe procure the phrases with which they lull the workers to sleep. And as the workers of these countries have inherited similar Proudhonist phrases from their predecessors the phraseology of the radicals still strikes a responsive chord among many of them. That is the case in France where the only Proudhonists still in existence are the middle-class radicals or republicans who call themselves Socialists. And if I am not mistaken you too have in your Cort s and in your press republicans of this type who call themselves Socialists because they see in the Proudhonian ideas a quite suitable means of opposing an adulterated middle-class socialism to true socialism, the rational and valid expression of the aspirations of the proletariat.
Letters: Karl Marx and Frederick Engels, Selected Correspondence 1891