 Complete the following phrase:  During the Cultural Revolution from 1966 to 1976, the Red Guard movement began in Beijing and the citys government fell victim to one of the first purges. By the autumn of 1966, all city schools were shut down and over a million Red Guards from across the country gathered in Beijing for eight rallies in Tiananmen Square with Mao. In April 1976, a large public gathering of Beijing residents against the Gang of Four and the Cultural Revolution in Tiamen Square 