Advocacy of class collaboration; abandonment of the idea of socialist revolution and revolutionary methods of struggle; adaptation to bourgeois nationalism; losing sight of the fact that the borderlines of nationality and country are historically transient; making a fetish of bourgeois legality; renunciation of the class viewpoint and the class struggle, for fear of repelling the “broad masses of the population”(meaning the petty bourgeoisie)—such, doubtlessly, are the ideological foundations of opportunism.
Lenin on Opportunism
