The biggest and most successful tomato grower in the northeastern United States has decided not to plant tomatoes this year because he’s afraid there won’t be enough labor available to plant and harvest his crop. Keith Eckle told Brownfield, because Congress hasn’t reformed current immigration law, he simply can’t risk planting a crop that could end up rotting in the fields.Later he points out that he's within 6 hours of the whole Northeast (located in PA, apparently--article doesn't specify).
"Our investment in those tomatoes is about $1.5 million," Eckle explained. "We cannot afford to plant that crop, put that much money out, and not know that we can harvest that crop."
Instead, Eckle will plant grain corn on his acres that normally go to tomatoes, pumpkins and sweet corn. But because produce is of such greater value, even with high commodity prices, Eckle said he’ll probably only make a third of the profit he enjoys in a typical year.
To me the logic of the local food/slow food movement is that each region becomes more self-sufficient (that's their logic, not something I endorse). But this shows the interdependencies which exist--you can have local tomatoes only if you're willing to import foreign labor. Or you can keep out foreign labor but only if you're willing to import foreign tomatoes. (As Robert Heinlein wrote, there's no such thing as a free lunch.) Note we aren't talking "organic" here--the devotees of that cause can scare up enough young native idealists to do that labor.