Frank Castaldi of northwest suburban Prospect Heights entered a guilty plea this afternoon to federal charges stemming from the accusation that he had bilked investors out of tens of millions of dollars in a lengthy Ponzi scheme. According to court documents, Castaldi managed to convince over 450 people to give him $77 million dollars to purchase 6 month promissory notes, which Castaldi guaranteed would net a 10% - 15% return on their investment. more ›