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 their supervisor told them to perform tasks that would likely involve walking on the mesh, Denton and Carlo refused because they feared they might suffer bodily injury or death. Because they refused 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?