eBay scammer Jay Nelson
"Eventually, however, Nelson's real name would feature prominently on another list: the most-wanted roster of the U.S. Postal Inspection Service, which is responsible for investigating most online-auction scams. He'd be charged with conducting more than $200,000 in illicit auctions, using 15 different screen names and ripping off 1,700 victims. "He found a method that worked," says Tom Higgins, the postal inspector who was the sole investigator who built the case against Nelson -- and who tracked him down after he fled. Nelson could produce new online identities almost at will, and "he could commit Internet fraud faster than we could investigate," Higgins says."