Americans have grown accustomed to year-round supplies of fresh, affordable fruit and vegetables. “Product of Mexico,” a four-part Los Angeles Times series, made vividly clear the human costs of this abundance. The 18-month investigation found that many farm laborers at Mexican export farms are essentially trapped for months at a time in rat-infested camps, often without beds and sometimes without functioning toilets or a reliable water supply. Those who seek to escape have to contend with guards, barbed-wire fences and threats of violence. Major U.S. companies have done little to enforce social responsibility guidelines that call for basic worker protections such as clean housing and fair pay practices.