Watch Harvest of Loneliness (2010) : Full Movie Online Free Shedding light on the current debate over immigration reform and the use of "guest workers" in American agriculture, this historical documentary, "Harvest Of Loneliness: The Bracero Program," examines what was known as the Bracero Program-a system put in place from 1942 to 1964 to recruit Mexican farm laborers for temporary work in the United States.