Gupta defense takes aim at trader's credibility

NEW YORK (Reuters) - Lawyers defending former corporate director Rajat Gupta on insider-trading charges sought on Wednesday to discredit a former hedge-fund trader who agreed to wear an FBI recording device and testify against others. Gupta, 63, is accused of providing his onetime friend and business associate, Galleon hedge fund founder Raj Rajaratnam, with boardroom secrets between March 2007 and January 2009 while he was a director at Goldman Sachs Group Inc and Procter & Gamble. Gupta says the prosecution's case is circumstantial and he has pleaded not guilty. ...