Discussion on question by user94511: Making a job offer to a candidate while privately advising them to decline

It's one thing hiding corporate dysfunction during an interview. Regardless of legalities and ethics, however, she surely must have obtained some insight as an intern.

If this other (nightmare) Manager is going to be managing her, would it not be prudent for the intern to meet with them first, before deciding whether or not to accept the offer? If it were me, I would certainly want to meet my prospective new Manager first, to get a feel for what to expect and how good the 'personality fit' would be. Because, the relationship with your direct Manager is so important.

There's are two real problems with telling the candidate. Firstly they may not respect the absolute confidentiality of that information. Secondly they may think the OP is trying to put them off to e.g. get the position for a friend. The OP needs to be ready for potential big problems with doing this. It's the ethical thing to do, but it won't necessarily look that way to the candidate (and the OP's employer - or next employer (!) if word gets back to them).

@Steve-O the OP stated that this other Manager is going to be managing the candidate, if they take the position, not the OP. You think it's unreasonable/unusual for a job candidate to meet with the person who is going to be their Manager?