A lawyer for former Goldman Sachs Group board member Rajat Gupta has told a court on Friday that a person at the firm, who has not been identified or charged in a broad US insider-trading probe, has been caught on a wiretap leaking secrets about Intel and Apple, Reuters has reported. A person familiar with the Gupta case said in early March that prosecutors are investigating David Loeb, a managing director of Goldman Sachs. Loeb works with technology hedge-fund employees, including an Asia-based analyst, Henry King, who is also under investigation, according to another source briefed on the case.