However, because of their inexperience in relation to veteran members such as Zhou Enlai and Zhang Guotao, the group was assigned to insignificant work. Then with the direct support from Mif, who came to China as envoy of Comintern, in the 4th Plenary Meeting of 6th National Congress of CPC in 1931 Wang and his associates won the battle with Li Lisan, who was incumbent paramount leader of CPC at that time, and Li's opponents of old CPC members, such as Labor activists He Mengxiong and Lin Yuying. Wang was appointed as member of politburo of CPC, with Mif took charge of CPC headquarter, Wang became the No1 in practice. As a reward, Bo Gu was appointed to be placed in charge of CY. When Wang returned Moscow for medical treatment, Qin was promoted to become a member of the Central Bureau of CPC, and then to be the General Secretary of the Communist Party of China in charge of daily work of CPC. Under the policy of extremism and leftism of Li and Wang, CPC suffered great loss in their power struggle with KMT in cities. In 1933 Bo Gu and other members of the Central Bureau such as Zhou Enlai had to evacuate to Soviet Territory, which was the power base set up by CPC, in the countryside, in Jiangxi. Bo Gu, Zhou and Otto Braun, the military advisor from Comintern, found a military command team to replace Mao Zedong's control over the military, who was chairman of the Chinese Soviet Government at that time. Due to a change in Nationalist tactics, the CPC Red Army suffered great losses in Chiang Kai-shek's 5th Suppression against them. Bo Gu and his team had to launch a strategic diversion.
