The Sixth U.S. Circuit Court of Appeals overturned a lower court decision that had cleared Freddie Mac of charges that it misled investors about its involvement in the subprime mortgage market. The lawsuit was filed in 2008 by the Ohio Public Employees Retirement System, which claimed Freddie made false public financial statements that hid its exposure to risky loans. The fund alleged that it lost more than $27.2 million as the value of Freddie stock plummeted. OPERS said...