The answer is the Amish, according to the Christian Science Monitor. And it turns out there's plenty of work for real property lawyers as a result. While we're on the subject, let's pay homage to the fun constitutional read, Wisconsin v. Yoder, which points to the issues described in the Monitor piece:
As the society around the Amish has become more populous, urban, industrialized, and complex, particularly in this century, government regulation of human affairs has correspondingly become more detailed and pervasive. The Amish mode of life has thus come into conflict increasingly with requirements of contemporary society exerting a hydraulic insistence on conformity to majoritarian standards. So long as compulsory education laws were confined to eight grades of elementary basic education imparted in a nearby rural schoolhouse, with a large proportion of students of the Amish faith, the Old Order Amish had little basis to fear that school attendance would expose their children to the worldly influence they reject. But modern compulsory secondary education in rural areas is now largely carried on in a consolidated school, often remote from the student's home and alien to his daily home life. As the record so strongly shows, the values and programs of the modern secondary school are in sharp conflict with the fundamental mode of life mandated by the Amish religion; modern laws requiring compulsory secondary education have accordingly engendered great concern and conflict.