 Walmart has countered this by saying that the strike is illegal due to the union not being sanctioned by the company, and that the striking workers are a small minority of the company's workforce, with the vast majority of workers willing and ready to work the retail industry's busiest day of the year.In May 2013, Walmart employees associated with a union-backed labor group called "OUR Walmart" began what it says will be the first "prolonged strikes" in Walmart's history.For Thanksgiving 2013, "CNN" estimates that approximately a million United States Walmart employees will work over the course of the holiday, with big specials starting at 6