Twelve-year-old Brian Glennon planned to spend his summer calling balls and strikes for 8-year-old batters, earning $10 a game from the Darien Youth Club baseball league. But thanks to an anonymous complaint, Brian and 35 other young umpires have been fired before the first pitch. Citing child-labor laws, the Illinois Department of Labor told the league in March to stop paying umpires who are not yet 14. "It kind of stinks," said Brian, who completed umpiring classes during the winter to qualify for the job, "because there's absolutely no point to it if you're not going to get paid." Parents...