Goldman Sachs Group Inc. faces a class-action lawsuit over two collateralized debt obligations it packaged and sold in 2006 and 2007, according to its latest quarterly regulatory filing. The CDO deals, called Hudson Mezzanine Funding 1 and 2, concern $1.2 billion of subprime and other residential mortgage-backed securities, many of which were sponsored by subprime mortgage lenders including Washington Mutual's Long Beach unit, New Century Financial Corp., Fremont General's Fremont unit, Countrywide Financial Corp., Lehman Brothers Holdings Inc. and Bear Stearns Cos.