13 In those matters which regard religion let it be seen how the sect of the Freemasons acts, especially where it is more free to act without restraint, and then let any one judge whether in fact it does not wish to carry out the policy of the naturalists. By a long and persevering labor, they endeavor to bring about this result - namely, that the teaching office and authority of the Church may become of no account in the civil State; and for this same reason they declare to the people and contend that Church and State ought to be altogether disunited. By this means they reject from the laws and from the commonwealth the wholesome influence of the Catholic religion; and they consequently imagine that States ought to be constituted without any regard for the laws and precepts of the Church.
Source: Humanum Genus (Vatican.va)