Bankruptcy may be the least of MF Global’s problems: the FBI is one of several federal agencies investigating the bankrupt brokerage firm run by former New Jersey governor Jon Corzine. According to The New York Times, there is no indication yet that any criminal laws were broken. But $600 million in customer money has yet to surface. The Commodity Futures Trading Commission and the SEC are investigating whether MF Global used customer funds to support its own trades to prop up the company in its final days. MF Global’s lawyers say that there is no shortfall.