Query: Who has left the U.S. to evade the law?

An associate is trying to find an American who left the country to operate a high-tech business, possibly illegal, outside the U.S. to evade American laws. Think hacking/cracking, money laundering, child porn, black market. This is for a profile in _Details_ magazine. Any tips? My friend is discreet and trustworthy and lives in New York City. -Declan