How to Catch a Spy

Thomas Cavanagh was a Northrop Corp. employee with military secrets to sell. In search of a buyer, he called Soviet emissaries in the U.S., arranged a meeting and offered "Stealth" bomber technology for a piddling $25,000. Even for so little, his hosts were not about to accept. The FBI had intercepted his original call, and the men to whom he was hawking his wares were undercover FBI agents. He was arrested, convicted and sentenced to life.

The sting was an example of how technology, stepped-up surveillance and a cooperative get-tough approach at the FBI and CIA are helping the U.S. to...

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