The next three government witnesses in the fraud and conspiracy trial of former Enron Corp. chiefs Kenneth Lay and Jeffrey Skilling are hardly household names but may still deliver testimony that is devastating to the defendants.

They include two government cooperators — one who pleaded guilty to insider trading — and a former in-house accountant who found financial chaos at a retail energy unit that Enron founder Lay and former Chief Executive Skilling touted publicly as a robust business that would bring in billions.