The UAW filed a lawsuit Tuesday against General Motors, claiming the automaker owes the union $450 million as part of a 3-year-old contract with its former parts division, Delphi. In the lawsuit, filed in U.S. District Court in Detroit, the UAW contends that GM was obligated through a labor contract and the bankruptcies of both GM and Delphi to pay $450 million intended for the UAW's Voluntary Employee Beneficiary Association for Delphi workers. That trust is to provide for retiree healthcare, the Detroit Free Press reports.