. "David Sheldon Boone"@en . . . "200"^^ . . "Selling Top Secret classified documents"@en . . "Conspiracy to commit espionage"@en . . "Flint, Michigan, USA"@en . "David Sheldon Boone is a former U.S. Army signals analyst who worked for the National Security Agency and was convicted of espionage-related charges in 1999 related to his sale of secret documents to the Soviet Union from 1988 to 1991. He is currently serving a prison sentence of 24 years and four months. Boone's case was an example of a late Cold War U.S. government security breach."@en . "David Sheldon Boone is a former U.S. Army signals analyst who worked for the National Security Agency and was convicted of espionage-related charges in 1999 related to his sale of secret documents to the Soviet Union from 1988 to 1991. He is currently serving a prison sentence of 24 years and four months. Boone's case was an example of a late Cold War U.S. government security breach."@en . . . . "7.573824E8"^^ . . "Financial gain"@en . "David Sheldon Boone"@en . . . . .