What’s ethical for undercover operatives? Anti-hate group entered gray zones.

David Gletty has wrestled alligators to prove his bona fides to extremists. He once shot up an empty Florida nightclub to deter an anti-racism event, to the delight of his FBI handlers. And as a solid roller skater, Mr. Gletty, a paid informant, performed on a roller derby TV show while investigating alleged tax fraud … Read more