Bo Gu
Following Chiang Kai-shek's Shanghai massacre of 1927, the CCP went deep underground in Shanghai and other cities. By the early 1930s, even that was unsafe and leaders began to converge at Mao Zedong's Jiangxi Soviet. Among the first to arrive, and to begin dismantling Mao's power, was Zhou Enlai. In 1933, when Bo Gu arrived, the job was mostly finished.