At the Red Guard rallies, Lin Biao also called for the destruction of the "Four Olds"; namely, old customs, culture, habits, and ideas. A revolutionary fever swept the country by storm, with Red Guards acting as its most prominent warriors. Some changes associated with the "Four Olds" campaign were mainly benign, such as assigning new names to city streets, places, and even people; millions of babies were born with "revolutionary"-sounding names during this period. Other aspects of Red Guard activities were more destructive, particularly in the realms of culture and religion. Various historical sites throughout the country were destroyed. The damage was particularly pronounced in the capital, Beijing. Red Guards also laid siege to the Temple of Confucius in Shandong province, and numerous other historically significant tombs and artifacts. Libraries full of historical and foreign texts were destroyed; books were burned. Temples, churches, mosques, monasteries, and cemeteries were closed down and sometimes converted to other uses, looted, and destroyed. Marxist propaganda depicted Buddhism as superstition, and religion was looked upon as a means of hostile foreign infiltration, as well as an instrument of the ruling class. Clergy were arrested and sent to camps; many Tibetan Buddhists were forced to participate in the destruction of their monasteries at gunpoint.