A U.S. and Greek national who worked on Meta’s security and trust team while based in Greece was placed under a yearlong wiretap by the Greek national intelligence service and hacked with a powerful cyberespionage tool, according to documents obtained by The New York Times and officials with knowledge of the case.

Christopher Wray, the F.B.I.’s director, told Congress last December that the bureau purchased the phone hacking tool Pegasus for research and development purposes.