A decade later, Costas’ death is caught up in an investigation into what now appears to have been a U.S. covert operation in Greece. Last February, Greek authorities took the extraordinary step of issuing an international arrest warrant for a CIA official the Greeks believe was a key figure in the operation while based in Athens. Unnoticed by the U.S. press, the warrant was a nearly unprecedented action by an allied country. The intelligence official, identified as William George Basil, was accused of espionage and eavesdropping. But by then he had already left the country, and the U.S. government, as it has done for the past 10 years, continues to stonewall Greek authorities on the agency’s involvement.
The Greek charges only touch the surface, however, and Basil may be less a key figure than simply a spy guilty of poor tradecraft. An investigation by The Intercept has uncovered not only the role of the CIA, but also that of the NSA, as well as how and why the operation was carried out. The investigation began while I was producing a documentary for PBS NOVA on cyberwarfare, scheduled to air on October 14, for which some of the interviews were conducted. In addition, I have had exclusive access to highly classified and previously unreported NSA documents released by Edward Snowden.
The Intercept, along with the Greek newspaper Kathimerini, interviewed over two dozen people familiar with the wiretapping case, ranging from U.S. intelligence officials and Greek government officials to those involved in the investigation and its aftermath. Many of those interviewed agreed to talk on condition that their names not be used, fearing criminal prosecution for speaking on intelligence matters or professional retribution. While some questions remain, the evidence points to a massive illegal eavesdropping program that may have led to Costas’ tragic death.