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The FBI on Monday released surveillance tapes, photos and hundreds of pages of documents that shed new light on operation "Ghost Stories," the bureau's investigation of a ring of Russian sleeper agents that ended after more than a decade in the biggest spy swap since the Cold War.

The FBI on Monday released surveillance tapes, photos and hundreds of pages of documents that shed new light on operation "Ghost Stories," the bureau's investigation of a ring of Russian sleeper agents that ended after more than a decade in the biggest spy swap since the Cold War.