Whirlpool operated a manufacturing facility that used overhead conveyors to transport parts around the plant. Because the parts sometimes fell from the overhead conveyor belt, Whirlpool installed a wire screen below the conveyor belts to catch them. Maintenance workers were required to retrieve fallen parts from the screen, which was about twenty feet above the floor of the plant. On two occasions, maintenance workers fell through the screen onto the floor. One of the workers was killed by the fall. Shortly thereafter, Vergil Deemer and Thomas Cornwell asked that the screen be repaired. When repairs were not made, these men complained to OSHA. The next day they were told by their supervisor to climb out onto the screen to retrieve fallen parts. When they refused, they were sent home without pay. Was their refusal a violation of their duty of obedience? (Whirlpool v. Marshall, 445 U.S. 1)