By Maya Rhodan
![NICHOLSON Harold J. Nicholson](https://api.time.com/wp-content/uploads/2014/04/spy-harold-nicholson.jpg?quality=75&w=2400)
![PITTS Earl Edwin Pitts](https://api.time.com/wp-content/uploads/2014/04/spy-earl-edwin-pitts.jpg?quality=75&w=2400)
![Ronald W. Pelton](https://api.time.com/wp-content/uploads/2014/04/spy-ronald-pelton.jpg?quality=75&w=2400)
![Walker Case John Anthony Walker](https://api.time.com/wp-content/uploads/2014/04/spy-john-walker.jpg?quality=75&w=2400)
![Former senior Central Intelligence Agency office A Aldrich Ames](https://api.time.com/wp-content/uploads/2014/04/spy-aldrich-ames.jpg?quality=75&w=2400)
![HANSSEN Robert Hanssen](https://api.time.com/wp-content/uploads/2014/04/spy-robert-hanssen.jpg?quality=75&w=2400)
![David Sheldon Boone](https://api.time.com/wp-content/uploads/2014/04/spy-david-boone.png?w=2400&quality=75)
![(FILES): This December 3, 1996 file phot Stewart Nozette](https://api.time.com/wp-content/uploads/2014/04/spy-stewart-nozette.jpg?quality=75&w=2400)
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