… the American Farmworker Fought Migrant Slavery, then Lost to H2A, 1975-1990” … GLC Brown Bag: Karin Zipf, “Field … the American Farmworker Fought Migrant Slavery, then Lost to H2A, 1975-1990” GLC Brown Bag: Karin Zipf, GLC … How the American Farmworker Fought Migrant Slavery, then Lost to H2A, 1975-1990” undergraduatefacultyalumniYale …