While Luther was in retirement at the Wartburg, his colleagues Carlstadt and Melanchthon, and the Augustinian friar Gabriel Zwilling, took up the movement at Wittenberg and carried out reforms more radical {82} than those of their leader. The endowments of masses were confiscated and applied to the relief of the poor on new and better principles. Prostitution was suppressed. A new order of divine service was introduced, in which the words purporting that the mass was a sacrifice were omitted, and communion was given to the laity in both kinds. Priests were urged to marry, and monks were almost forced to leave the cloister. An element of mob violence early manifested itself both at Wittenberg and elsewhere. An outbreak at Erfurt against the clergy occurred in June, 1521, and by the end of the year riots took place at Wittenberg. Even now, at the dawn of the revolution, appeared the beginnings of those sects, more radical than the Lutheran, commonly known as Anabaptist. The small industrial town of Zwickau had long been a hotbed of Waldensian heresy. Under the guidance of Thomas Muenzer the clothweavers of this place formed a religious society animated by the desire to renovate both church and state by the readiest and roughest means. Suppression of the movement at Zwickau by the government resulted only in the banishment, or escape, of some of the leaders. [Sidenote: December 27, 1521] Three of them found their way to Wittenberg, where they proclaimed themselves prophets divinely inspired, and conducted a revival marked with considerable, though harmless, extravagance. [Sidenote: January 20, 1522] As the radicals at Wittenberg made the whole of Northern Germany uneasy, the Imperial Council of Regency issued a mandate forbidding all the innovations and commanding the Elector of Saxony to stop them. It is remarkable that Luther in this felt exactly as did the Catholics. Early in March he returned to Wittenberg with the express purpose of checking the reforms which had already gone too far {83} for him. His personal ascendency was so great that he found no trouble in doing so. Not only the Zwickau prophets, but Carlstadt and Zwilling were discredited. Almost all their measures were repealed, including those on divine service which was again restored almost to the Catholic form. Not until 1525 were a simple communion service and the use of German again introduced. [Sidenote: Rebellion of the knights, 1522-3]