At 8 a.m. Sunday the population of Kinsman, Ill., stood at 109. An hour later it nearly doubled, as upwards of 100 federal agents and police swooped in on the tiny, rural community. And no one seems to know why. The law enforcement officers, including FBI agents, immigration officials and state police, surrounded an Islamic meat plant in Kinsman, cordoning off the area and briefly detaining the plant's handful of employees. The FBI isn't saying much, and the county sheriff is mum too, leaving Kinsman's residents mystified. The bust, in a town that has no local police force, involved dozens...