In 1989, French counterintelligence agents watched Felix Bloch as he dined in Paris with known Soviet spy “Pierre Bart.” Bloch placed a black bag under the table, which he left behind as he exited the restaurant. Felix Bloch, former Chargé d’Affaires at the U.S. Embassy in Vienna, was one of the highest ranking Foreign Service Officers ever to be suspected of espionage. He later claimed that the encounter was an innocent exchange of postage stamps between two fellow collectors. The contents of the black bag from the incident were never recovered, and it was therefore impossible to say whether any classified material had changed hands.
The FBI continued surveillance of Bloch while he worked in Berlin until a cryptically worded call from “Bart,” whose real name was Reino Gikman, indicated that the investigation had been blown. It was later revealed that Robert Hanssen, famously convicted spy within the FBI, had alerted the KGB to the investigation. U.S. officials confronted Bloch, but he vehemently denied he had engaged in espionage with a KGB agent and refused to cooperate further. Suddenly, the initially promising case against Bloch faltered without enough conclusive evidence to prove the allegations in court.