The Obama administration has increased enforcement efforts against illegal use of children as farm laborers.  This article by Erik Eckholm in the New York Times describes the particulars of children and teenagers working in blueberry fields in North Carolina, as well as reform efforts under consideration in Congress: U.S. Cracks Down on Farmers Who Hire Children.  Here’s a report from Human Rights Watch in May 2010 on the subject called Fields of Peril.