Damaging wiretapped phone calls have provided overwhelming proof that Raj Rajaratnam was at the center of a corrupt insider trading ring that netted him more than $63 million in illegal profits, a prosecutor said yesterday.

Southern District Assistant U.S. Attorney Reed M. Brodsky told a federal jury that dozens of wiretapped conversations, coupled with the direct testimony of people who conspired with the Galleon Group hedge fund founder, leave no doubt Mr. Rajaratnam is guilty of shady stock trades.