Linda,?
I will leave your query to another person,
However if you have a restricted group, you can screen potential members so that you must approve each one. That may weed out bad guys!
See?
/g/GroupManagersForum/wiki/Screening-New-Members-Using-the-Pending-Subscription-Noticeand in:
/static/help#membernotices
Pending Subscription
Sent automatically to anyone who applies for membership in a restricted group. The notice marked "active" is the one sent; if no notice is active, none is sent. Some groups use this notice to ask a series of questions of applicants in support of their application; responses will go to the group owner address and be recorded in the member¡¯s page under "+owner messages."
Frances
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/g/GroupManagersForum/wiki
/static/helpMore help: use the search button at the top of the Messages list.