Throughout this period, which is by no means yet over, the issue of work has of course been posed on the basis of the great conflict that in the age of, and together with, industrial development emerged between "capital" and "labour", that is to say between the small but highly influential group of entrepreneurs, owners or holders of the means of production, and the broader multitude of people who lacked these means and who shared in the process of production solely by their labour. The conflict originated in the fact that the workers put their powers at the disposal of the entrepreneurs, and these, following the principle of maximum profit, tried to establish the lowest possible wages for the work done by the employees. In addition there were other elements of exploitation, connected with the lack of safety at work and of safeguards regarding the health and living conditions of the workers and their families

This conflict, interpreted by some as a socioeconomic class conflict, found expression in the ideological conflict between liberalism, understood as the ideology of capitalism, and Marxism, understood as the ideology of scientiflc socialism and communism, which professes to act as the spokesman for the working class and the worldwide proletariat. Thus the real conflict between labour and capital was transformed into a systematic class struggle, conducted not only by ideological means but also and chiefly by political means. We are familiar with the history of this conflict and with the demands of both sides. The Marxist programme, based on the philosophy of Marx and Engels, sees in class struggle the only way to eliminate class injustices in society and to eliminate the classes themselves. Putting this programme into practice presupposes the collectivization of the means of production so that,through the transfer of these means from private hands to the collectivity, human labour will be preserved from exploitation. (Papal Encyclical, Laborem Exercens, 14 September 1981)