WASHINGTON—A Michigan judge has thrown out a lawsuit that General Motors filed against Stellantis’s Fiat Chrysler Automobiles (FCA) that accused its rival of fraud and unfair competition. GM sued FCA in 2019, alleging it bribed United Auto Workers (UAW) union officials over many years to corrupt the bargaining process and gain advantages, costing GM billions of dollars. Wayne County Circuit Judge David Allen on Friday dismissed GM’s state court lawsuit, which also named two former FCA executives who previously pleaded guilty in a Justice Department bribery probe. The judge said that GM “failed to adequately demonstrate that FCA caused it any actual, legally recognizable harm through its bribery scheme.” Allen noted that GM’s allegations against FCA spanned more than a decade, dating back to 2009, adding: “Even the most enthralling drama must eventually reach a conclusion. This one is no exception.” GM’s lawsuit had sought “damages in an amount to …