Robert Hanssen, who was convicted of spying for the Soviet Union and Russia, conducted dead drops there.

One account relates: Within a mile of his home, Foxstone Park meanders along Wolftrap Creek through Hanssen's neighborhood and a golf course.

The drop site codenamed ELLIS was a dark, damp place under a footbridge[2] Another account relates: He was caught one evening, minutes after leaving a dead drop under a footbridge at Wolftrap Creek in Foxstone Park, near his house in Vienna, Virginia.

FBI agents also found $50,000 the Russian Foreign Intelligence Service (SVR...) left for him at another site.

[4] He was charged with selling U.S. secrets to the Soviet Union and subsequently the Russian Federation for more than US$1.4 million in cash and diamonds over a 22-year period.