And the U.S. government has blocked one of South Africa’s leading Muslim clerics from entering the United States. Fazlur Rahman Azmi of South Africa arrived in San Francisco on Friday. He was questioned for hours and then forced to leave the country. The Islamic Society of East Bay had invited Azmi to lead prayers at mosques around the Bay Area to mark the end of the holy month of Ramadan. Last week the Department of Homeland prevented another leading Muslim scholar from entering the United States. Kamal Helbawy, the 80-year-old founder of the Muslim Association of Britain, was scheduled to speak in New York at a conference organized by the New York University Law School.