A federal judge in New York has given the go-ahead for a group of investors in an IndyMac Bank MBS offering to proceed as a class in a suit against Credit Suisse, the offering’s underwriter. The June 29 ruling by U.S. District Judge Lewis Kaplan granted a December 2010 request for class certification to investors as they allege Credit Suisse misled them about the quality of toxic loans underlying a $642 million MBS offering in 2006. The plaintiffs claim in their suit that the sale of the MBS, Residential Asset Securitization Trust 2006-A8, sponsored by IndyMac Bank, violated the Securities Act of 1933 because the offering falsely represented that the underlying mortgage loans were originated in accordance with IndyMac’s underwriting standards.