to have detained one of their most challenging communist adversaries but successful in turning the spymaster against the communists making Gu the most notorious intelligence traitors in modern Chinese history. As Gu provided the KMT with a flood of Teke agents' names and safe house locations, Zhou's spy inside the BIS, Qian Zhuangfei, immediately notified Zhou and Kang Shang who were able to relocate every Teke agent within two days — avoiding a potential extermination of CCP's core. Some agents, however, were located and arrested. On 21 June 1931, presumably with help from Gu's defection, the KMT captured CCP General Secretary Xiang Zhongfa hiding in a jewelry store with his cabaret dancer mistress. Despite offering to convert to the KMT party, Xiang was shot by his jailers before the received word of Chiang Kai-shek's pardon. Though the CCP's nascent intelligence branch under Kang Shang had narrowly escaped destruction, the damage done by Gu's defection and the number of communist spy arrests attrited the group until, in 1935 the CCP elected to disband it. While many of Teke's agents moved to the Red Army's Political Protection Bureau (PPB) led by Dong Fa, the PPB focused entirely on counterintelligence meaning real intelligence collection would go largely dormant until the formation of the Social Affairs Department. Central Social Affairs Department (1936–1955) In 1936, the CCP established in Yan'an, Shaanxi the Social Affairs Department, often abbreviated as SAD in English, to consolidate the party's foreign intelligence and counterintelligence efforts. It wasn't until 1938 when Kang Sheng took control of the department and restructured the organization that it took its final form in the merging of the preceding Special Branch, the Political Protection Bureau (which Kang Sheng had previously headed), and the Guard Office. The Political Protection Bureau provided rear area security to communist forces prior to the Long March and close security to Mao during the march while the Guard Office established a local constabulary and counterintelligence service. Under Kang Sheng and his deputy Li Kenong, the SAD provided the CCP foreign intelligence, domestic intelligence, military security, and political security in every province in which communist forces held terrain. The Social Affairs Department was constructed similarly to the Soviet model (as Kang had been trained by Soviet intelligence in Moscow): Section 1 was responsible for administration and personnel, Section 2 was responsible for intelligence collection, Section 3 was responsible for counterintelligence, Section 4 was