Should intelligence agencies be able to sweep our email, read our texts, track our phone calls, locate us by GPS? Much of the conversation swirls around the possibility that agencies like the N.S.A. or the F.B.I. will use such information not to serve national security but to carry out personal and political vendettas. King’s experience reminds us that these are far from idle fears, conjured in the fevered minds of civil libertarians. They are based in the hard facts of history.Beverly Gage is a professor of American history at Yale.
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