The documentary "Food Chains" brings the problems of migrant farm workers in the United States' food system to mainstream light in a way seldom seen since Edward R. Murrow's 1960 TV documentary "Harvest of Shame," which forced American families to think about how their Thanksgiving dinner got to the table. More than 50 years later, the challenge for farm workers has developed from a lack of respect from farm owners to a lack of care from supermarkets.
