What happened to the men who had falsely accused Daniel?

Answer: They were thrown to the lions

At the king's command the accusers, with their wives and children, were thrown into the den, and the lions overpowered them.

“At the command of the king, the men who had falsely accused Daniel were brought and thrown into the den of lions—they and their children and wives. And before they had reached the bottom of the den, the lions overpowered them and crushed all their bones.”— Daniel 6:24 (BSB)