Hanssen was the ultimate "sleeper"—a seemingly ordinary suburban father and devout church member who used his top-secret clearance to leak names of U.S. double agents and defense secrets.
Articles under this subtitle often explore "nontraditional collectors"—foreign researchers working in U.S. laboratories who are accused of stealing intellectual property. subtitle The Spy Next Door
One of the most prominent uses of this title refers to the true story of , an FBI agent who spied for the Soviet and Russian intelligence services for over 20 years. subtitle The Spy Next Door