A Harvard Business School graduate tricked his fellow alumni and associates into investing at least $2.9 million in a Ponzi scheme he ran, New York Attorney General Letitia James said Thursday. James' office said it had secured a court order blocking the grad, Vladimir Artamonov, "from harming investors through his fraudulent scheme," which allegedly projected returns of 500% to 1,000% by claiming to learn which investments Berkshire Hathaway planned to make. The order in Manhattan Supreme Court also bars Artamonov from withdrawing and transferring funds in his bank and brokerage accounts. Artamonov allegedly lured at least 29 investors into the scheme, most of whom he met through his connections to the elite college, the attorney general said. More from Personal Finance:This IRS issue is 'the bi