The Holy Synod consisted of bishops and a Procurator-general who represented the czar and as such could veto any resolution. This official was often a general. Every bishop had to keep a school in his palace, and the sons of priests who refused to attend were taken as soldiers. Autocrat though he was, Peter dared not confiscate the property of the monasteries, but he forbade any person to enter a convent before his thirtieth year. The monks were ordered to work at some trade, or to teach in the schools and colleges. At this time, the Protestant and Catholic churches of the West tried to make converts, and the _raskols_ were hostile to the national church. As a rule Peter did not favor persecution; so long as the church did not interfere with his authority, there was nothing to fear from him; but upon the slightest suspicion his heavy hand was felt. Thus, in 1710, he suddenly ordered the expulsion of the Jesuits. He used to say: "God has given the czar power over the nations, but Christ alone has power over the conscience of man." This did not prevent him from exacting a double tax from the raskols in Moscow, nor from punishing cruelly any Russian converted to one of the western churches. The great mass of the people suffered severely by Peter's reforms. The peasants as tenants of the large landowners had enjoyed some liberty and were legally free men; they were by him assigned to the soil, which they were not permitted to leave. Thus they, too, passed into serfdom. If the proprietor sold the estate, the rural population (p. 166) went with it. The owners paid a poll-tax for their serfs. These unfortunates could also be sold without the land, but the czar made a law that "If the sale cannot be abolished completely, serfs must be sold by families without separating husbands from wives, parents from children, and no longer like cattle, a thing unheard of in the whole world." The citizens of towns were divided into three classes; to the first class belonged bankers, manufacturers, rich merchants, physicians, chemists, capitalists, jewelers, workers in metal, and artists; storekeepers and master mechanics were in the second; all other people belonged to the third. Foreigners could engage in business, acquire real estate; but they could not depart from the country without paying to the government one tenth of all they possessed. Cities and towns were administered by burgomasters elected by the citizens; this board selected its own president or mayor. If an important question arose, representatives of the first two classes were summoned for consultation. All the mayors of Russia were subject to a magistrate selected from the Council of St. Petersburg, and appointed by the czar. This official watched over the interests of commerce and agriculture, settled disputes between citizens and burgomasters, confirmed local elections, authorized executions when a death sentence was pronounced by provincial authorities, and made reports to the tsar.