The case could test whether the agencies’ ratings are constitutionally protected as a form of free speech.
The lawsuit asserts that Moody’s, Standard & Poor’s and Fitch were in league with the banks and other issuers, helping to create an assortment of exotic financial instruments that led to a disastrous bubble in the housing market.
“We believe that the credit rating agencies, in exchange for fees, departed from their objective, neutral role as arbiters,” the attorney general, Richard Cordray, said at a news conference. “At minimum, they were aiding and abetting misconduct by issuers.”

