The New York Times has published an unredacted version of the famous “suicide letter” from the FBI to Dr. Martin Luther King, Jr. The letter, recently discovered by historian and professor Beverly Gage, is a disturbing document. But it’s also something that everyone in the United States should read, because it demonstrates exactly what lengths the intelligence community is willing to go to—and what happens when they take the fruits of the surveillance they’ve done and unleash it on a target.