External lawyers, auditors, accountants — those owing their clients fiduciary duties, confidences and (for lawyers at any rate) offering them the somewhat holey cloak of legal professional privilege, such that one’s usual paranoia about the disclosure of proprietary data, trade secrets and intellectual property can be safely set aside. You can tell your professional advisers your innermost thoughts — and your client’s — without a great risk that the cat contained therein will be let out of the bag.
See also