DealBook – In April 2009, an F.B.I. agent visited the Silicon Valley home of Richard Choo-Beng Lee, a hedge fund manager with deep contacts inside technology companies. The government, the agent said, had overwhelming proof that Mr. Lee had engaged in insider trading. Within weeks, Mr. Lee confessed and began cooperating.
A year and a half later, in the parking lot of a New England prep school, the same agent approached Noah Freeman, a Harvard-educated money manager turned teacher. After the agent played a secretly recorded conversation of Mr. Freeman swapping illegal tips, Mr. Freeman admitted to crimes and started assisting the authorities.
