四五运动
Deng's reputation as a reformer suffered a severe blow when the Qingming Festival, after the mass public mourning of Zhou on a traditional Chinese holiday, culminated in the Tiananmen Incident on 5 April 1976, an event the Gang of Four branded as counter-revolutionary and threatening to their power. Furthermore, the Gang deemed Deng the mastermind behind the incident, and Mao himself wrote that "the nature of things has changed". This prompted Mao to remove Deng from all leadership positions, although he retained his party membership. As a result, on 6 April 1976 Premier Hua Guofeng was also appointed to Deng's position as Vice Chairman and at the same time received the vacant position of First Vice Chairman, which Zhou had held, making him Mao's fourth official successor.