This is the biggest problem with H-1B visas.
Wanna bet that the following has happened with H-1B holders
1 holder finds out about something illegal or otherwise questionable in the business And is then told to keep silent or you will get fired and deported.
2 requiring bribes to keep your job (or "extra" fees that a US worker does not even hear about)
3 Off Books/Unpaid work
4 requiring Daughters/Wives "model" for or "entertain" the managers/ friends