Bob Woodward & Carl Bernstein Watching Nixon Resign

Deep Throat stamped his foot. “A conspiracy like this . . . a conspiracy investigation . . . the rope has to tighten slowly around everyone’s neck. You build convincingly from the outer edges in, you get ten times the evidence you need against the Hunts and Liddys. They feel hopelessly finished—they may not talk right away, but the grip is on them. Then you move up and do the same thing at the next level.” 

― Carl Bernstein, All the President’s Men