The group behind the United Football League (UFL), which includes RedBird Capital Partners, FOX, ESPN, Dany Garcia and Dwayne "The Rock" Johnson, has gained a new investor in Thoroughbred owner Mike Repole. The story first appeared in The Athletic. In a statement Thursday, the spring football league said Repole's private equity firm, Impact Capital, "will lead the league's business operations" going forward. A UFL spokesperson declined to specify how much Repole paid for his ownership stake, but he did confirm that the billionaire is one of the league's top three...