Georgia's tough anti-illegal-immigrant law drove a sizable fraction of the migrant labor pool out of the state, and as a result, "millions of dollars' worth of blueberries, onions, melons and other crops [are] unharvested and rotting in the fields." http://www.theatlantic.com/business/archive/2011/06/georgias...

Surely there would be some way to legalize low cost unskilled workers at the expense of giving them some basic rights.