Tribus Circiter §1

¹ About three years ago this Apostolic See was duly informed that some priests, especially among the junior clergy of your dioceses, had founded, without permission from their lawful Superiors, a kind of pseudo-monastic society, known as the Mariavites or Mystic Priests, the members of which, little by little, turned aside from the right road and from the obedience they owe the Bishops "whom the Holy Ghost has placed to rule the Church of God," and became vain in their thoughts.