13 If, at the beginning of the persecution, Catholics were able to make a defense of their religion in the public press by means of articles which made clear the truth and answered the lies and errors of their enemies, it is now no longer permitted these citizens, who love their country just as much as other citizens do, to raise their voices in protest. As a matter of fact, they are not even allowed to express their sorrow over the injuries done to the Faith of their fathers and to the liberty of divine worship. We, however, moved profoundly as We are by the consciousness of the duties imposed upon Us by our Apostolic office, will cry out to heaven, Venerable Brothers, so that the whole Catholic world may hear from the lips of the Common Father of all the story of the insane tyranny of the enemies of the Church, on the one hand, and on the other that of the heroic virtue and constancy of the bishops, priests, religious congregations, and laity ot Mexico.
Source: Iniquis Afflictisque (Vatican.va)