A former agent reveals what he thinks of the F.B.I. since he left.

ROSA BROOKS is a law professor at Georgetown University and the author of “How Everything Became War and the Military Became Everything.” By ROSA BROOKS

THESE ARE STRANGE TIMES. In the not-too-distant past, those on America’s political left viewed the F.B.I. with suspicion, while those on the right applauded the bureau’s investigations into unions, civil rights groups and antiwar protesters, all of...

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