Prosecutors have played taped phone conversations at the start of the evidence phase of the insider trading trial of a one-time billionaire hedge fund boss.
Prosecutors have said the probe of Rajaratnam and others was the biggest hedge fund insider trading case in history. Rajaratnam had pleaded not guilty to conspiracy and security fraud charges.
In all, more than two dozen people have been charged. Nineteen have pleaded guilty.
Rajaratnam is the only person to stand trial so far. He remains free on $100 million bail.