How to report people with immigration tendency and bad behavior?

Your question is too vague. First of all, immigration is a personal choice, and no organization can stop it unreasonably. Secondly, to what extent is the so-called "bad behavior"? If he violates the law and wants to transfer state assets or escape through immigration, you can naturally report to the local public security, discipline inspection and other institutions-provided that you have substantial evidence to prove it.