Enron is about the only one I heard of out of the US - here we had several big-name corporate failures and the lead auditor partner who were complicit in one major banking fraud case (he got "loans" from the bank like the FTX CEO who loaned him and others billions)

KPMG is being sued for R863m for that one - it seems the quality of work, oversight and ethics of some are severely lacking in these firms.