Penal Code," which was unofficially called Calles Law. It provided specific penalties for priests and individuals who violated the provisions of the 1917 Constitution. For instance, wearing clerical garb in public, outside church buildings, earned a fine of 500 pesos (then the equivalent of US$250), and priests who criticized the government could be imprisoned for five years. Some states enacted oppressive measures. Chihuahua enacted a law permitting only one priest to serve all Catholics in the state. To help enforce the law, Calles seized church property, expelled all foreign priests and closed monasteries, convents and religious schools. Rebellion Peaceful resistance In response to the measures, Catholic organizations began to intensify their resistance. The most important group was the National League for the Defense of Religious Liberty, founded in 1924, which was joined by the Mexican Association of Catholic Youth, founded in 1913, and the Popular Union, a Catholic political party founded in 1925. In 1926, Calles intensified tensions against the clergy by ordering all local churches in and around Jalisco to be bolted shut. The places of worship remained shut for two years. On July 14, Catholic bishops endorsed plans for an economic boycott against the government, which was particularly effective in west-central Mexico (the states of Jalisco, Michoacán, Guanajuato, Aguascalientes, and Zacatecas). Catholics in those areas stopped attending movies and plays and using public transportation, and Catholic teachers stopped teaching in secular schools. The bishops worked to have the offending articles of the Constitution amended. Pope Pius XI explicitly approved the plan. The Calles government considered the bishops' activism to be sedition and had many more churches closed. In September 1926, the episcopate submitted a proposal to amend the Constitution, but the Mexican Congress rejected it on September 22. Escalation of violence On August 3, in Guadalajara, Jalisco, some 400 armed Catholics shut themselves in the Church of Our Lady of Guadalupe ("Santuario de Nuestra Señora de Guadalupe"). They exchanged gunfire with federal troops and surrendered when they ran out of ammunition. According to American consular sources, the battle resulted in 18 dead and 40 wounded. The following day, in Sahuayo, Michoacán, 240 government soldiers stormed the parish church. The priest and his vicar were killed in the ensuing violence. On August 14, government agents staged a purge of the Chalchihuites, Zacatecas, chapter of the Association of Catholic Youth and executed its spiritual adviser, Father Luis Bátiz Sainz. The