For the success of the working class struggle the unity of two fundamental elements, namely the Marxist world view and the militant action of the working class, is essential. This unity has been profoundly shattered by the unfavourable conditions which began with the retreat of the revolutionary wave in Western Europe and which, especially after World War II, were characterised both by the dominance of Stalinism and by the resurgence of the capitalist system. Deprived for a long time of the revolutionary action of the working class, the “theory” degenerated and broke away from its true Marxist roots. Thus, a current of pseudo-Marxism, a direct product of these conditions of defeat, began to spread from the university chairs, especially in the Western European countries.