Skinning, gutting, and cutting up catfish is not easy or pleasant work. No one knows this better than Randy Rhodes, president of Harvest Select, which has a processing plant in impoverished Uniontown, Ala. For years, Rhodes has had trouble finding Americans willing to grab a knife and stand 10 or more hours a day in a cold, wet room for minimum wage and skimpy benefits. Most of his employees are Guatemalan. Or they were, until Alabama enacted an immigration law in September that requires police to question people they suspect might be in the U.S. illegally and punish businesses that hire them. The law, known as HB56, is intended to scare off undocumented workers, and in that regard it’s been a success. It’s also driven away legal immigrants who feared being harassed.