[img]http://d.yimg.com/a/p/rids/20100422/i/r2708545894.jpg?x=88&y=130&q=85&sig=CDkhpeU4zs4w5a.vwiBvcQ--[/img]AP - A Goldman Sachs trading executive is disputing the government's fraud allegations against him and insisting he didn't mislead two investors in a complex mortgage securities transaction.