The “smoking guns” were dropped in a Chicago river. Only the “guns” were not guns. They were hard drives. And the suspect is not a gangster, a la Al Capone. Instead, it is a programmer and former employee of Citadel, the computer-driven hedge fund in the Windy City.

On Thursday, that former Citadel employee, Yihao Ben Pu, was arrested. The charges? Downloading trade secrets off Citadel’s trading systems and then trying to use them for his own financial benefit.

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