遵义会议
In 1938, he attended the CPC Central Military Commission North Branch's meeting. In March, he was sent by the CCP Central Committee to negotiate with the Comintern in Moscow. In July, he officially replaced Wang Jiaxiang as the representative of CCP at Comintern. Ren returned to Yan'an on 26 March 1940, serving in the Secretariat and the Organizational Department of the CCP. In April 1942, he led the Yan'an Rectification Movement in the Shan-Ganning region. Ren, alongside Mao and Liu Shaoqi as members of the Organizational Department of the CCP, became in charge of the northwest regions of Gansu-Ningxia and Shanxi, and in the same month, was in charge of organizing the 8th Route Army based in Xi'an. Ren was part of a team that concluded the leadership problems between the Fourth Plenary Session and the Zunyi Conference in the "Resolution on Certain Questions in the History of the CCP" report.