Article by lawyers for whistleblowers on whether Rudy Giuliani can claim the protection of the attorney client privilege

A few days ago I posted a short comment on Rudy Giuliani and the practice of law.  In it, I questioned whether he understands the notion of the attorney-client privilege. 

Now, here is a new article by several lawyers who represent whistleblowers on how they (the authors) have used the crime-fraud exception to the privilege in the past to deny the use of the privilege and on why they think that Giuliani will not be able to claim the privilege successfully.