Two men were convicted Wednesday for participating in a telemarketing scheme that defrauded victims, many of whom were seniors, out of millions of dollars, the Justice Department announced.

A federal jury found 30-year-old Manuel Chavez of Florida and 36-year-old Mark Oman of Washington guilty on multiple wire fraud and money laundering charges after they posed as U.S. government officials and falsely told victims they had won a “sweepstakes” prize, according to court documents.