During the Cultural Revolution from 1966 to 1976, the Red Guard movement began in Beijing and the city's 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 Tian'anmen Square with Mao. In April 1976, a large public gathering of Beijing residents against the Gang of Four and the Cultural Revolution in Tiananmen Square was forcefully suppressed. In October 1976, the Gang was arrested in Zhongnanhai and the Cultural Revolution came to an end. In December 1978, the Third Plenum of the 11th Party Congress in Beijing under the leadership of Deng Xiaoping reversed the verdicts against victims of the Cultural Revolution and instituted the "policy of reform and opening up."