FBI agent Robert Hanssen was one of the most damaging spies in US history. From 1979 to 2001, Hanssen delivered some of the United States governments' most sensitive secrets to Soviet and Russian agents, who used them to not only undermine US national security, but to identify and execute individuals who were working with the FBI. And despite an awareness of spies working within the FBI, Hanssen managed to operate for more than two decades before finally getting caught.

In this episode we speak with CBS News' Major Garrett, whose new podcast Agent of Betrayal: The Double Life of Robert Hanssen, explores Hanssen's decision to spy on the US and how he managed to operate for so long without being caught. A thoroughly researched history with all the turns of a great true crime podcast, we think you'll enjoy Agent of Betrayal, available on Apple podcasts, Spotify, or anywhere else you get your podcasts.

This episode was edited by Gary Fletcher.