When a user is removed from a meeting series (via User Editor, click on trash can), this user is

1. removed from "visibleFor" of the meeting series - OK!
2. removed from "visibleFor" of all child minutes - OK!

So, the meeting series and the child minutes are not visible to the user and not published to the user.

BUT: We forgot to remove the user role from the user document in MongoDB. So if other parts of the app (e.g. Attachments) rely on the user role the make false decisions.