Kang Sheng
Kang Sheng was the mastermind behind the "pain and friction" that underlay the Rectification process. He used a classic Soviet technique of accusing loyal party members of being Nationalist spies. Once they had confessed under torture, their confessions could then set off an avalanche of accusations and arrests. As the war worsened in 1943, and the Communist area become more isolated, Kang stepped up the speed and ferocity of the purges.