Following his U.S. Army service, Chin applied to and was accepted by the
CIA. He was assigned as a Chinese language translator and analyst of the Chinese Communist press at the
Foreign Broadcast Information Service (FBIS), where he continued his espionage for China. He was posted in
Okinawa (1952–61),
Santa Rosa, California (1961–71) and
Rosslyn, Virginia (1971–81). As an FBIS analyst and one of the CIA's few fluent Chinese linguists, Chin was able to pass along such information as
Intelligence Information Reports (IIRs) on China and
East Asia, biographical profiles and assessments of fellow CIA employees, and the names and identities of the Agency's covert agents. He was also in a position to provide information about recruited deep-cover agents in China. Due to the CIA's policy of internal compartmentalization, Chin did not know their real names or identities; however, based on the intelligence they provided, he could infer such things as their locations, employers, and levels of access. Chinese counterintelligence could then attempt to identify them by determining who had access to what information. Once the agents were identified, they would routinely be arrested and executed, or, alternatively, fed false information to be communicated to the CIA. Most significantly, in 1970 Chin provided to the Maoist leadership in
Beijing CIA documents that revealed the plans of President
Richard Nixon to engage China in order to form a tactical alliance against (and put pressure on) the
Soviet Union. Mao, knowing in advance of American designs and objectives, could squeeze maximum concessions from the Nixon administration. == Exposure ==