Nobody likes to see people having to work without pay, but that's just the situation air traffic controllers in the U.S. find themselves in. They're an absolutely essential service, so they have no choice but to keep showing up every day, even when their pay stubs are empty.
It's a horrible situation, having to rely on folks whose workplace morale must be tenuous at best for the safety of planes in the sky. I can't imagine having to go into work knowing that I was making zero dollars for my efforts.