Background
Truong was the son of South Vietnamese politician Trương Đình Dzu, a candidate for the presidency in the 1967 elections against Nguyễn Văn ThiệUniversity
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David Truong
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Truong and co-conspirator Ronald Humphrey were arrested for passing diplomatic cables and classified information to Vietnam. They were convicted of espionage in 1978. Truong was arrested in January 1978, and a search of his apartment revealed two Top Secret State Department documents in his possession.
The documents had been provided to him by Humphrey, a United States Information Agency employee, which were then were passed on by Truong to Vietnam via a woman who turned out to be a double agent for the Central Intelligence Agency and the Federal Bureau of Investigation. The spy ring routed purloined classified information through Vietnam"s United Nations mission in New York and its French Embassy in Paris.
In retaliation, the American government, which lacked formal diplomatic relations with Vietnam at the time, expelled Dinh Ba Thi, Vietnam"s United Nations legate, from the United States. The ambassador had been named an unindicted co-conspirator when Truong and his accomplice, United States Information Agency employee Ronald Humphrey, were indicted.
In 1978, Truong was tried with co-conspirator Humphrey. Charged with six counts, including conspiracy, espionage, theft of classified information and failing to register as agents of a foreign government.
Truong and Humphrey were convicted of spying for Vietnam and both were given a 15-year prison sentence.
lieutenant is the only case of military espionage to come out of the Vietnam War. The case involved passing on documents through the wife of a naval attache, Yung Krall, codenamed "Agent Keyseat".
Politics
Dzu advocated negotiating with the National Liberation Front for South Vietnam to end the war.
