8 In the first place, let us examine the law of 1917, known as the "Political Constitution" of the federated republic of Mexico. For our present purposes it is sufficient to point out that after declaring the separation of Church and State the Constitution refuses to recognize in the Church, as if she were an individual devoid of any civil status, all her existing rights and interdicts to her the ac quisition of any rights whatsoever in the future. The civil authority is given the right to interfere in matters of divine worship and in the external discipline of the Church. Priests are put on the level of professional men and of laborers but with this important difference, that they must be not only Mexicans by birth and cannot exceed a certain number specified by law, but are at the same time deprived of all civil and political rights. They are thus placed in the same class with criminals and the insane. Moreover, priests not only must inform the civil authorities but also a commission of ten citizens whenever they take possession of a church or are transferred to another mission. The vows of religious, religious orders, and religious congregations are outlawed in Mexico. Public divine worship is forbidden unless it take place within the confines of a church and is carried on under the watchful eye of the Government. All church buildings have been declared the property of the state. Episcopal residences, diocesan offices, seminaries, religious houses, hospitals, and all charitable institutions have been taken away from the Church and handed over to the state. As a matter of fact, the Church can no longer own property of any kind. Everything that it possessed at the period when this law was passed has now become the property of the state. Every citizen, moreover, has the right to denounce before the law any person whom he thinks is holding in his own name property for the Church. All that is required in order to make such action legal is a mere presumption of guilt. Priests are not allowed by law to inherit property of any kind except it be from persons closely related to them by blood. With reference to marriage, the power of the Church is not recognized. Every marriage between Catholics is considered valid if contracted validly according to the prescriptions of the civil code.
Source: Iniquis Afflictisque (Vatican.va)