53 And here we are reminded of the confraternities, societies, and religious orders which have arisen by the Church's authority and the piety of Christian men. The annals of every nation down to our own days bear witness to what they have accomplished for the human race. It is indisputable that on grounds of reason alone such associations, being perfectly blameless in their objects, possess the sanction of the law of nature. In their religious aspect they claim rightly to be responsible to the Church alone. The rulers of the State accordingly have no rights over them, nor can they claim any share in their control; on the contrary, it is the duty of the State to respect and cherish them, and, if need be, to defend them from attack. It is notorious that a very different course has been followed, more especially in our own times. In many places the State authorities have laid violent hands on these communities, and committed manifold injustice against them; it has placed them under control of the civil law, taken away their rights as corporate bodies, and despoiled them of their property, in such property the Church had her rights, each member of the body had his or her rights, and there were also the rights of those who had founded or endowed these communities for a definite purpose, and, furthermore, of those for whose benefit and assistance they had their being. Therefore We cannot refrain from complaining of such spoliation as unjust and fraught with evil results; and with all the more reason do We complain because, at the very time when the law proclaims that association is free to all, We see that Catholic societies, however peaceful and useful, are hampered in every way, whereas the utmost liberty is conceded to individuals whose purposes are at once hurtful to religion and dangerous to the commonwealth.
Source: Rerum Novarum (Vatican.va)