"Fulfilling the demand for unskilled labor is a big part of the immigration bill unveiled by a group of bipartisan senators this week. One of the oldest and certainly the largest guest worker program in United States history was that of the Braceros. Nearly 5 million Mexican laborers worked in U.S. fields over the course of two decades. Even as Congress debates future programs, unresolved issues remain with both current and past guest workers." - Mónica Ortiz Uribe, Apr. 17, 2013.