Freddie Mac’s former chief executive and former chief financial officer need to tell regulators about the role Wall Street firms played in questionable transactions that contributed to the company’s $5 billion restatement, federal judges ruled last week. Former CEO Leland Brendsel and former CFO Vaughan Clarke, two of three top executives who departed Freddie Mac in June, tried to quash subpoenas filed against them by the Office of Federal Housing Enterprise Oversight. OFHEO has