The U.S. private sector lost 33,000 jobs in June, according to new data from payroll-processing firm ADP, marking a sharp reversal from expectations of continued employment growth and raising fresh concerns about the labor market’s trajectory. Economists surveyed by Econoday had forecast a gain of 103,000 jobs for the month. Instead, the report released Wednesday morning showed the first monthly decline in private-sector employment since January 2021. Manufacturing, which had been a weak spot in the labor market, added a solid 15,000 jobs. Construction added 9,000 jobs. Natural resources and mining, which includes oil and natural gas extraction, added 8,000...