CLIFTON SPRINGS NY--On Aug. 28, dairy farmer Rodney Brown had no workers to milk the some 600 cows on his farm outside Clifton Springs. He went to the home of his Mexican workers, also located on his property, and found it empty. Finally, he reached a worker on his cell phone and learned that Immigration & Customs Enforcement officials had come at milking time, 6 a.m., and taken six men. Brown said he’d been using Mexican workers since 1999, with no problems. Two of the workers taken had been with him since the beginning. And their papers said they were...