Hu Jintao denounced during the Cultural Revolution, an event that (together with his relatively humble origins) apparently had a deep effect upon Hu, who diligently tried to clear his father's name. He joined the Communist Party of China (CPC) in April 1964 and began to work as an engineer in July 1965 after he graduated from the Water Conservancy Engineering Department at Tsinghua University, where he majored in the study of hub hydropower stations. During his time at Tsinghua, he met his wife Liu Yongqing. In 1968, Hu volunteered for his service in Gansu and worked on the construction of Liujiaxia Hydroelectric
Hu Jintao uprising. What occurred after is a matter of dispute. Rioters accused the police of shooting them arbitrarily, and the police claimed that they had acted in self-defense. In addition, there was speculation that Hu delayed his orders to clamp down on the protesters until late into the evening, when the police chief was forced to act because the situation was spiraling out of control. The protesters were suppressed early into the next day, and Hu asked Beijing to declare martial law on 8 March. Hu's role in the demonstrations and rioting on 5 March was never made clear. While it