What did the Fugitive Slave Act require all Americans to do?

It just made it to where any white guy could say any black person in any state was their slave and that he had ran away. So a white slave owner could leave Alabama and go to Indiana and say that the local black tailor was his slave and he'd legally be able to take him.

The Fugitive Slave Act required Americans to capture any runaway slaves and return them to their owners.