Eric O’Neill took to Twitter, saying he regrets not asking Robert Hanssen -- the former FBI agent who was sentenced to life in prison in 2002 for spying on America for Russia -- why he betrayed ...

Notorious spy Robert Hanssen was found dead in federal prison at the age of 79. Getty Images. Hanssen’s nefarious activities began in 1985, when he had been working for the FBI for almost a decade.

Robert Philip Hanssen, who received payments of $1.4 million in cash and diamonds for the information he gave the Soviet Union and Russia, has died, the Federal Bureau of Prisons announced Monday.

Robert Hanssen, FBI agent convicted of spying for Russia, has died 00:25. Robert Hanssen, a former FBI agent who was one of the most damaging spies in American history, was found dead in his ...

Robert Hanssen, a former FBI agent who received more than $1.4 million for committing espionage on behalf of Moscow, died in prison, officials said.

Robert P. Hanssen, a former F.B.I. agent who spied for Moscow off and on for more than two decades during and after the Cold War in one of the most damaging espionage cases in American history ...