2 We designedly use the words "the heavy burden of these great evils" for certain of Our children, deserters from the army of Jesus Christ and enemies of the Common Father of all, have ordered and are continuing up to the present hour a cruel persecution against their own brethren, Our most beloved children of Mexico. If in the first centuries of our era and at other periods in history Christians were treated in a more barbarous fashion than now, certainly in no place or at no time has it happened before that a small group of men has so outraged the rights of God and of the Church as they are now doing in Mexico, and this without the slightest regard for the past glories of their country, with no feelings of pity for their fellow-citizens. They have also done away with the liberties of the majority and in such a clever way that they have been able to clothe their lawless actions with the semblance of legality.
Source: Iniquis Afflictisque (Vatican.va)