Lee Eugene Madsen was a Navy yeoman assigned to the Strategic Warning Staff at the Pentagon, who was arrested in 1979 on charges of selling classified material to an undercover FBI agent. It was believed that his intent was to sell them to organized crime figures. He was sentenced to eight years in prison.
(From: https://books.google.com/books?id=2wNgbdnKuKAC&lpg=PA185&ots=5jn--DeJto&dq=lee%20eugene%20madsen%20espionage&pg=PA185#v=onepage&q=lee%20eugene%20madsen%20espionage&f=false)
The Counterintelligence Chronology by