How can I create an invisible forum and restrict members to it?

[bulletinuser1]

This is a 2 part question.

How do I create an invisible forum that is not viewable to registered users?

How do I restrict a user so that they can only access the invisible forum (which of course must be viewable to them, but not other registered users)?

The purpose of what I am trying to do is basically create a small private forum for users who disrupt the general forums. This way they can talk to other users who share a common interest (creating problems).

Any suggestions are appreciated.