At a hearing last week, McDonald explained how the two men allegedly created fake tax returns and other financial documents to mislead investors.
"This relationship developed as they went after more sophisticated investors who demanded more due diligence," McDonald said.
According to federal prosecutors, the three men offered more than 400 investors in numerous states the chance to profit from consumer debt portfolios - mostly student loans or credit card debt that had been defaulted on - that were owned by Ledford.
Rather than invest the money given to them by investors, the three men pocketed much of it, prosecutors said, and used some to pay off earlier investors and keep the scheme going.
Prosecutors said the victims included "small-business owners, restaurateurs, construction contractors, retirees, doctors, lawyers, accountants, bankers, talent agents, professional athletes," at least five of whom experienced significant financial hardship that the defendants allegedly were aware of.
The three men allegedly used the proceeds of their fraud to sustain a lavish lifestyle across multiple states, purchasing expensive jewelelry, sports cars, mansions and an interest in a private jet. They spent millions gambling in Las Vegas, according to court documents.
The alleged scheme operated from 2013 through September 2018.
It was discovered when an undercover FBI agent was offered the opportunity to invest in one of the allegedly fraudulent debt portfolios.
Merrill and his wife also faced obstruction of justice charges after the pair allegedly conspired to hide funding from the Justice Department following Merrill's arrest.