The largest financial fraud in history wasn't Enron's colossal accounting crimes, Bernie Madoff's record-setting Ponzi scheme or the Libor scandal, in which some of the world's biggest banks conspired to profit by manipulating interest rates. No, the largest financial fraud in history is one most Americans know little to nothing about. It isn't mentioned by politicians, reported on the nightly news or discussed by coworkers during lunch break. The...