5 We must above all deplore with overwhelming sadness that in not a few nations the rights of God, Church and human nature itself are outraged and trampled upon. Sacred ministers, even those invested with high dignities, are either driven from their proper Sees, exiled and imprisoned, or impeded in a manner preventing them from exercising their ministry. In the field of education, whether of lower or of university level, as well as in publications and the Press, permission to explain and defend the doctrine of the Church either is not given or is so restricted and subjected to such surveillance by official censorship that the arbitrary proposition that truth, liberty and religion must submissively serve only the civil authority seems to be the established principle.
Source: Anni Sacri (Vatican.va)