From 1978 until 1985, Adolf G. Tolkachev worked as a CIA agent -- spy -- in the Soviet Union. He supplied a treasure trove of technical information from his position at the Scientific Research Institute of Radio Building (NIIR).
Royden, Barry G. "An Exceptional Espionage Operation: Tolkachev, A Worthy Successor to Penkovsky." Studies in Intelligence 47, no. 3 (2003). [https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/csi-studies/studies/vol47no3/article02.html]
The author of this article, who obviously had direct access to the DO's files on Tolkachev, provides a detailed case study of a human intelligence operation. It deserves to be read by anyone interested in the spy game.
Schudel, Matt. "Cold War Spy Tale Came to Life on the Streets of Moscow." Washington Post, 20 Apr. 2008, C8. [http://www.washingtonpost.com]
This is the obituary for John I. Guilsher, 77, who died 4 April 2008. Guilsher was the case officer for Soviet senior engineer Adolf G. Tolkachev from January 1979 until June 1980. Tolkachev continued his espionage until 1985 when he was exposed by Edward Lee Howard; he was executed in September 1986.
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