Ad Sinarum Gentem §4

⁴ But as We must be solicitous for the eternal salvation of each person, We cannot hide the sadness and affliction of Our soul in learning that, although the great majority of Catholics have remained steadfast in the Faith, still there are some in your midst who, either deceived in their good faith, or overcome by fear, or misled by new and false doctrines, have adhered, even recently, to dangerous movements being promoted by the enemies of all religion, especially of the religion divinely revealed by Jesus Christ.