Denton and Carlo were employed at an appliance plant. Their job required them to perform occasional maintenance work while standing on a wire mesh twenty feet above the plant floor. Other employees had fallen through the mesh, and one of them had been killed by the fall. When Denton and Carlo were asked by their supervisor to perform tasks that would likely require them to walk on the mesh, they refused because of their fear of bodily harm or death. Because of their refusal to do the requested work, the two employees were fired from their jobs. Was their discharge wrongful? If so, under what federal employment law? To what federal agency or department should they turn for assistance?