University of Maryland Shoppers walk out of a Walmart store in Maryland May 4. The Occupational Safety and Health Administration has not cited the nation’s largest retailer despite employee complaints, illnesses and deaths at Walmart facilities across the country. The company says there is no proof that employees contracted COVID-19 at work. Sandra Kunz had been worried for her safety while working as a cashier at a Walmart in Aurora, Colorado, during the pandemic, said her sister, Paula Spellman. The 72-year-old had lung disease, Spellman said. She was “uncomfortable because so many people (were) coming in with coughs.” But Kunz didn’t complain to the government agency tasked with protecting workers, the Occupational Safety and Health Administration.