The Department of Justice filed a civil action in Los Angeles this week against Standard & Poor’s Rating Services and its parent the McGraw-Hill companies for $5 billion, accusing S&P of defrauding investors by falsely representing that its ratings on certain collateralized debt obligations were “objective, independent and unencumbered by any conflicts of interest.” The Justice Department’s complaint alleges that S&P “knowingly and with the intent to defraud, devised, participated in, and executed a scheme to defraud investors” in its ratings of “trillions of dollars” of residential MBS and CDOs between 2004 and 2007. DOJ contends...