The cases where the government has proved in a court of law that a company is in violation of the statute or regulation. I am not aware of any successful prosecutions here other than maybe Cognizant which was in the news some time ago.
"Q Are any PERMs denied for fraud? A Not to my knowledge."
There is a PERM process, the government overwhelmingly approves it, it does not take anything to court or win. I am not sure what you are trying to argue.
[1] https://storage.courtlistener.com/recap/gov.uscourts.mad.266...
1. https://www.federalregister.gov/documents/2007/05/17/E7-9250...
This is misleading. "Fraud" is a legal term, and it's difficult to prove. However, DoL can and will do an audit to verify that the PERM application is correct. If the audit fails (and they fail them often) they just deny the petition.
It's not a large percentage, but nowhere near the "never heard about DoL denying a petition" level.