XXXIII. Of excommunicate Persons, how they are to be avoided
That person which by open denunciation of the Church is rightly cut off from the unity of the Church, and excommunicated, ought to be taken of the whole multitude of the faithful, as an Heathen and Publican, until he be openly reconciled by penance, and received into the Church by a Judge that hath authority thereunto.
So what do you think justifies excommunication? Do you agree with this article?