23 The future of these younger generations (We repeat it with all the anguish of Our paternal heart) awakens in Us the most urgent solicitude and the most lively anxiety. We know to how many perils the children and youth are exposed, today more than ever, everywhere, but particularly in Mexico, where an immoral and antireligious press implants in their hearts the seeds of apostasy from Jesus Christ. To remedy such grave evil and defend your youth from these perils, it is necessary that every legal means be taken and every form of organization be put in motion, as for example, the Leagues of Fathers of Families and the morality and vigilance committees for publications and censorship of the cinema.
Source: Firmissimam Constantiam (Vatican.va)