Kang Sheng was a Chinese Communist Party (CCP) official, best known for having overseen the work of the CCP's internal security and intelligence apparatus during the early 1940s and again at the height of the Cultural Revolution in the late 1960s and early 1970s. A member of the CCP from the early 1920s, he spent time in Moscow during the early 1930s, where he learned the methods of the Soviet NKVD and became a supporter of Wang Ming for leadership of the CCP. After returning to China in the late 1930s, Kang Sheng switched his allegiance to Mao Zedong and became a close associate of Mao during the Second Sino-Japanese War, the Chinese Civil War, and after. He remained at or near the pinnacle of power in the People's Republic of China from its establishment in 1949 until his death in 1975. After the death of Mao and the subsequent arrest of the Gang of Four, Kang Sheng was accused of sharing responsibility with the Gang for the excesses of the Cultural Revolution and in 1980 he was expelled posthumously from the CCP.

The Chinese Communist Party (CCP), officially the Communist Party of China (CPC), is the founding and sole ruling party of the People's Republic of China (PRC). Under the leadership of Mao Zedong, the CCP emerged victorious in the Chinese Civil War against the Kuomintang. In 1949, Mao proclaimed the establishment of the People's Republic of China. Since then, the CCP has governed China and has had sole control over the People's Liberation Army (PLA). Successive leaders of the CCP have added their own theories to the party's constitution, which outlines the party's ideology, collectively referred to as socialism with Chinese characteristics. As of 2023, the CCP has more than 98 million members, making it the second largest political party by membership in the world after India's Bharatiya Janata Party.