SALT LAKE CITY — A group of unions, environmental and civic organizations, and local governments has filed a lawsuit challenging the planned restructuring of the U.S. Forest Service, which includes moving the agency’s headquarters to Salt Lake City and closing regional offices and research facilities. The plaintiffs are alleging that the reorganization would impair the Forest Service’s ability to manage national forests, and they are seeking a preliminary injunction to prevent the USDA administration from moving forward with its reorganization plan. …The lawsuit was filed by Democracy Forward on behalf of more than 30 groups, including the American Federation of Government Employees and American Federation of State, County and Municipal Employees, which represent the USDA employees that will be impacted by the reorganization. The lawsuit alleges that restructuring the Forest Service in this way will reduce the agency’s capacity to sustainably manage national forests and engage in fire response and prevention efforts.