American Spies, Then And Now (SLIDESHOW)

Walter Ken Myers and his wife Gwendolyn Steingraber Myers have just been accused of spying on the U.S. for nearly thirty years for Castro's Cuba. While a headline-grabbing revelation, they're hardly the first to slip American secrets abroad. From the Rosenbergs to Robert Hanssen, here's a slideshow of some of the best known turncoats in U.S. history:

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