With little fanfare, Robert Greenwald has become one of the most incisive activist filmmakers in America. Like his superb eve-of-the-election docs, Uncovered: The War on Iraq and Outfoxed:Rupert Murdoch’s War on Journalism, Wal-Mart: The High Cost of Low Price is an investigative outcry driven by stringent reporting rather than attitude. Mixing statistics and employee testimony, Greenwald details business practices that provoke a gathering outrage: the coerced unpaid overtime, the foreign sweatshop labour, the risible health-insurance packages, the sucking dry of mom-and-pop stores.