Trustee for Liquidation of Bernard L. Madoff Investment Securities Files Against Tremont Group and Related Entities Including Oppenheimer and MassMutual;

the suit are Oppenheimer Acquisition Corp. ("Oppenheimer"), which acquired Tremont Group in 2001, and Oppenheimer's parent corporations MassMutual Holding LLC ("MassMutual Holding") and Massachusetts Mutual Life Insurance Company ("Mass Mutual")....