The U.S. Labor Department has asked a federal court to overturn the election of all officers at a troubled Los Angeles union local, alleging that the organization made it too difficult for challengers to qualify for the ballot. In a civil complaint against the Service Employees International Union's largest California chapter, the department contends that the March election of local President Tyrone Freeman and his slate of officers violated labor laws. Freeman is the target of a separate criminal investigation into the local's spending practices. The election complaint notes that the local required candidates to collect more than 4,800 nomination...