In a climate where whistleblowing requires enormous courage, and where whistleblowers are subject to harm, ridicule and scorn (even after they risk everything to expose the problem/corruption), it's not surprising that only a few of these type cases are ever made by the Feds. It doesn't mean however that these type of things aren't done on a regular basis. Case in point: Brooklyn.
What is disturbing is that elected officials tacitly suborn corruption by their routine lack of courage.