40 In the first place we notice a progressive improvement in the economic and social condition of working men. They began by claiming their rights principally in the economic and social spheres, and then proceeded to lay claim to their political rights as well. Finally, they have turned their attention to acquiring the more cultural benefits of society. Today, therefore, working men all over the world are loud in their demands that they shall in no circumstances be subjected to arbitrary treatment, as though devoid of intelligence and freedom. They insist on being treated as human beings, with a share in every sector of human society: in the socio-economic sphere, in government, and in the realm of learning and culture.
Source: Pacem in Terris (Vatican.va)