CathInfo.com

8. We are convinced, Venerable Brethren, that you will diligently take care to see that all these directives of Ours are conscientiously and exactly fulfilled, carefully and constantly reporting to Us concerning this very serious problem. Since We have taken this matter under Our jurisdiction and, after hearing the views of the Bishops, since the decision rests with Us, We hereby command all Catholics of good will to desist from all disputes among themselves concerning this matter. We are confident that with fraternal charity and perfect obedience they will completely and gladly carry out Our command. If any further difficulty arises among them, they should seek its solution in the following manner: Let them first turn to their Bishops for counsel, and then submit the matter to the Apostolic See for its decision.

There is one more point to consider, and it was already implied in what has been said. On the one hand, no one could accuse of bad faith and, under such a pretext, bear ill will toward those who, while firmly defending the teachings and rights of the Church, nonetheless for good reasons have joined or wish to join mixed labor associations in those places where, under certain safeguards, ecclesiastical authority has permitted them in view of local conditions. On the other hand, it would likewise be most reprehensible to oppose or attack the purely Catholic associations (this type of association must, on the contrary, be supported and promoted in every possible manner), and to demand that the so-called intercredal associations be introduced and force their establishment on the grounds that all Catholic associations in every diocese ought to be set up along one and the same pattern.

http://w2.vatican.va/content/pius-x/en/encyclicals/docuмents/hf_p-x_enc_24091912_singulari-quadam.html

Being greatly moved by the deplorable condition of the Indians in Lower America, our illustrious predecessor Benedict XIV pleaded their cause, as you are aware, in most weighty words, in his letter Immensa Pastorum, given on December 22, 1741; and since we also have to deplore in many places almost the same things that he then lamented, we most earnestly recall those letters of his to your memory. For therein, among other things, Pope Benedict complained that although the Apostolic See had done much, and for a long time, to relieve their afflicted fortunes, there were even the "men of the orthodox faith who, as if they had utterly forgotten all sense of the charity poured forth in our hearts by the Holy Ghost, presumed to reduce the wretched Indians, without the light of faith, and even those who had been washed in the laver of regeneration, to servitude, or to sell them as slaves to others, or to deprive them of their property, and to treat them with such inhumanity that they were thus greatly hindered from embracing the Christian faith, and most strongly moved to regard it with abhorrence." It is true that soon afterwards the worst of these indignities - that is to say, slavery, properly so called - was, by the goodness of the merciful God, abolished; and to this public abolition of slavery in Brazil and in other regions the excellent men who governed those Republics were greatly moved and encouraged by the maternal care and insistence of the Church. And we gladly acknowledge that if it had not been for many and great obstacles that stood in the way, their plans would have had far greater success. Nevertheless, though much has thus been done for the Indians, there is much more that still remains to be done. And, indeed, when we consider the crimes and outrages still committed against them, our heart is filled with horror, and we are moved to great compassion for its most unhappy race. For what can be so cruel and so barbarous as to scourge men and brand them with hot iron, often for most trivial causes, often for a mere lust of cruelty; or, having suddenly overthrown them, to slay hundreds or thousands in one unceasing massacre; or to waste villages and districts and slaughter the inhabitants, so that some tribes, as we understand, have become extinct in these last few years?

http://w2.vatican.va/content/pius-x/en/encyclicals/docuмents/hf_p-x_enc_07061912_lacrimabili-statu.html

3. For our part, indeed, when reports of these things were first brought to us, we hesitated for some time to give credence to such atrocities, since they certainly seemed to be incredible. But after we had been assured by abundant witnesses - to wit, by many of yourselves, Venerable Brethren, by the Delegates of the Apostolic See, by the missioners, and by other men wholly worthy of belief - we can no longer have any doubt as to the truth of these statements.

http://w2.vatican.va/content/pius-x/en/encyclicals/docuмents/hf_p-x_enc_07061912_lacrimabili-statu.html