So, you know when you go to the playground and there's someone who tells everyone which slide to go down and when to wait their turn? Well, imagine there's a big playground with lots of planes flying in the sky and someone needs to tell them where to go and when it's safe to land. That's what air traffic controllers do.
In 1968, the air traffic controllers in the United States got together and made a group called the Professional Air Traffic Controllers Organization. They did this so they could work together to make sure they were all trained well and could do their job safely.
Before this, each air traffic controller worked for their own airport or place where planes land and take off. But by joining together, they could share information and help each other out when needed.
This group also helped the air traffic controllers make sure they were paid fairly for their important work. They wanted to have good working conditions and make sure they didn't get overworked, because they knew that if someone made a mistake in their job, it could be really dangerous for the planes and people involved.
Overall, the Professional Air Traffic Controllers Organization made things better for air traffic controllers and made air travel safer for everyone.