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.

Wang Ming was a senior leader of the early Chinese Communist Party (CCP) and the mastermind of the famous 28 Bolsheviks group. Wang was also a major political rival of Mao Zedong during the 1930s, opposing what he saw as Mao's nationalist deviation from the Comintern and orthodox Marxist–Leninist lines. According to Mao on the other hand, Wang epitomized the intellectualism and foreign dogmatism Mao criticized in his essays "On Practice" and "On Contradiction". The competition between Wang and Mao was a reflection of the power struggle between the Soviet Union, through the vehicle of the Comintern, and the CCP to control both the direction and future of the Chinese Communist Revolution.