One of its leaders, Qiu Chuji became a teacher of Genghis Khan before the establishment of the Yuan dynasty. (and used his influence to save millions of lives). Originally from Shanxi and Shandong, the sect established its main center in Beijing's Baiyunguan ("White Cloud Monastery"). Before the end of the dynasty, the Celestial Masters sect (and Buddhism) again gained preeminence. In 1406, Yongle Emperor of Ming dynasty commanded that all Taoist texts be collected and combined into a new version of the "Daozang." The text was finally finished in 1447, and took nearly forty years to complete. The fall of the Ming Dynasty and the subsequent establishment of the Qing dynasty by the Manchus was blamed by some literati on religion, specifically Taoism. They sought to regain power by advocating a return to Confucian orthodoxy in a movement called "Hanxue", or "Han Learning." This movement returned the Confucian classics to favor and nearly completely rejected Taoism. During the eighteenth century, the imperial library was constituted, but excluded virtually all Taoist books. Through the Qing-administered agency Bureau of Taoist Registrations, the number of officially ordained Taoist masters was limited. Sponsored Taoist ritual and study sites were also restricted and controlled. By the beginning of the twentieth century, Taoism had fallen much from favor (only one complete copy of the "Daozang" still remained, at the White Cloud Monastery in Beijing). Kuomintang(Chinese Nationalist Party) leaders embraced science, modernity, and Western culture, including (to some extent) Christianity. Viewing the popular religion as reactionary and parasitic, they confiscated some temples for public buildings, and otherwise attempted to control traditional religious activity. The Communist Party of China, officially atheistic, initially suppressed Taoism along with other religions. During the Cultural Revolution from 1966 to 1976, many Taoist temples and sites were damaged and Monks and priests were sent to labor camps. Persecution of Taoists stopped in 1979, and many Taoists began reviving their traditions. Subsequently, many temples and monasteries have been repaired and reopened. Taoism is one of five religions recognized by the PRC, which regulates its activities through the China Taoist Association. Sensitive areas include the relationship of the Zhengyi Taoists with their sect's lineage-holder, who lives in Taiwan, and various traditional temple activities such as astrology and shamanism, which have been criticized as "superstitious".