Michael Weiss is the coauthor of The New York Times bestseller ISIS: Inside the Army of Terror and of The Menace of Unreality: How Russia Weaponizes Information, Culture and Money. He lives in New York.

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UNDERCOVER

Before Zelimkhan Khangoshvili was taken down with a silenced Glock, he’d thwarted terror attacks and fingered Russian agents. An exclusive interview with his Georgian case officer.