【History Talk】Six famous double agents in history.

According to reports from Agence France-Presse (AFP) and Reuters, on June 6, 2023, the United States Federal Bureau of Prisons announced that Robert Hanssen, a former FBI double agent who had secretly provided some of the highest-level U.S. secrets to Russia in the 1980s and 90s, was found unconscious in a heavily guarded prison. Despite attempts to resuscitate him, he was pronounced dead at the age of 79. The Federal Bureau of Prisons did not disclose the cause of Hanssen's death.