UAW Members Authorize Strike at GM Plant: About 2,200 workers at General Motors Corp.'s Marion, Ind., stamping plant gave the go-ahead for a strike against the auto maker if negotiators cannot resolve longstanding labor disputes. The vote, taken Thursday, is the first step toward a possible walkout at the plant, which supplies stamped metal parts to several GM assembly plants, said a spokesman for United Auto Workers Union Local 977. If negotiations fail to resolve the issues, the union will ask UAW officials in Detroit to issue a five-day warning letter before any walkout can occur. GM was forced to idle 10 assembly plants last week due to a strike at a key parts plant in Flint, Mich. It settled the strike after agreeing to hire hundreds of new workers for the facility.