Which former FBI agent was convicted of espionage?

The correct answer is the former FBI agent who was convicted of espionage, Robert Hanssen. Hanssen served as an FBI agent for more than two decades and during that time, he engaged in espionage activities that severely compromised U.S. intelligence operations. He was arrested in 2001 and subsequently pleaded guilty to charges of spying for Russia over a period of 15 years. His actions are considered among the most damaging security breaches in U.S. history, leading to significant losses in terms of operational intelligence and the safety of agents abroad.

The conviction of Hanssen was significant not only because of the severity of his offenses but also due to the level of access he had to sensitive U.S. intelligence. This case underscores the importance of counterintelligence programs designed to detect and prevent espionage, as well as the need for continued vigilance in safeguarding national security information.

Other individuals mentioned, while having backgrounds that may raise questions, do not have a documented history of espionage convictions comparable to Hanssen's case, making Hanssen the clear focal point in discussions of espionage within the context of former FBI agents.