Threat of Dissent"Suspicion of foreigners goes back to the earliest days of the republic Kraut traces how different ideologies would be considered intolerably dangerous according to the dominant fears of a given era. Anarchism gave way to communism; communism gave way to Islamic radicalism." Jennifer Szalai, New York Times "Magisterial and well written A gripping, expansive story that traces the consequences of suspicions of 'un American' ideologies and loyalties in