"... and through a psychological victory in the Korean War, which altogether caused the deaths of several-million Chinese."
"... In 1958, he launched the Great Leap Forward that aimed to rapidly transform China's economy from agrarian to industrial, which led to the deadliest famine in history and the deaths of 20–46 million people between 1958 and 1962."
"... In 1963, Mao launched the Socialist Education Movement, and in 1966 he initiated the Cultural Revolution, a program to remove "counter-revolutionary" elements in Chinese society which lasted 10 years and was marked by violent class struggle, widespread destruction of cultural artifacts, and an unprecedented elevation of Mao's cult of personality. Tens of millions of people were persecuted during the Revolution, while the estimated number of deaths ranges from hundreds of thousands to millions, including Liu Shaoqi, the 2nd Chairman of the PRC. "
Not related but even worse:
"... During Mao's era, China's population grew from around 550 million to over 900 million while the government did not strictly enforce its family planning policy, forcing Mao's successors such as Deng Xiaoping to take stricter policies to cope with the overpopulation crisis."