Following tlle lines laid dawn by the Encyclical Rerum Novarum and many later documents of the Church's Magisterium, it must be frankly recognized that the reaction against the system of injustice and harm that cried to heaven for vengeance13 and that weighed heavily upon workers in that period of rapid industrialization was justified from the point of view of social morality. This state of affairs was favoured by the liberal socio-political system, which, in accordance with its "economistic" premises, strengthened and safeguarded economic initiative by the possessors of capital alone, but did not pay sufficient attention to the rights of the workers, on the grounds that human work is solely an instrument of production, and that capital is the basis, efficient factor and purpose of production.

From that time, worker solidarity, together with a clearer and more committed realization by others of workers' rights, has in many cases brought about profound changes. Various forms of neo - capitalism or collectivism have developed. Various new systems have been thought out. Workers can often share in running businesses and in controlling their productivity, and in fact do so. Through appropriate associations, they exercise influence over conditions of work and pay, and also over social legislation. But at the same time various ideological or power systems, and new relationships which have arisen at various levels of society, have allowed flagrant injustices to persist or have created new ones. On the world level, the development of civilization and of communications has made possible a more complete diagnosis of the living and working conditions of man globally, but it has also revealed other forms of injustice, much more extensive than those which in the last century stimulated unity between workers for particular solidarity in the working world. This is true in countries which have completed a certain process of industrial revolution. It is also true in countries where the main working milieu continues to be agriculture or other similar occupations.

Movements of solidarity in the sphere of work - a solidarity that must never mean being closed to dialogue and collaboration with others - can be necessary also with reference to the condition of social groups that were not previously included in such movements but which, in changing social systems and conditions of living, are undergoing what is in effect "proletarianization" or which actually already find themselves in a "proletariat" situation, one which, even if not yet given that name, in fact deserves it. This can be true of certain categories or groups of the working " intelligentsia", especially when ever wider access to education and an ever increasing number of people with degrees or diplomas in the fields of their cultural preparation are accompanied by a drop in demand for their labour. This unemployment of intellectuals occurs or increases when the education available is not oriented towards the types of employment or service required by the true needs of society, or when there is less demand for work which requires education, at least professional education, than for manual labour, or when it is less well paid. Of course, education in itself is always valuable and an important enrichment of the human person; but in spite of that, "proletarianization" processes remain possible.

For this reason, there must be continued study of the subject of work and of the subject's living conditions. In order to achieve social justice in the various parts of the world, in the various countries, and in the relationships between them, there is a need for ever new movements of solidarity of the workers and with the workers. This solidarity must be present whenever it is called for by the social degrading of the subject of work, by exploitation of the workers, and by the growing areas of poverty and even hunger. The Church is firmly committed to this cause, for she considers it her mission, her service, a proof of her fidelity to Christ, so that she can truly be the "Church of the poor". And the "poor" appear under various forms; they appear in various places and at various times; in many cases they appear as a result of the violation of the dignity of human work: either because the opportunities for human work are limited as a result of the scourge of unemployment, or because a low value is put on work and the rights that flow from it, especially the right to a just wage and to the personal security of the worker and his or her family.