Howdy again. The picture where you are shushing him is awesome! Group owners can 'clean up' a group by deleting inactive members. Whoever owns the group you are talking about must be a regular 'cleaner.'
i think the group ejection thing is happening automatically thru the site now... group owners do have a "purge inactive members" button, but i never use it... and i've had complaints of the same thing happening to others with the private group i run... just FYI.