Spark users can copy people to different groups

Here’s one for you all, i have spark to bring in users from ldap and place them in certain groups depending on the securty group i give them. Here’s the funny thing spark users can copy people to different groups so there will be duplicate users in two or more different group and i can not figure out a way to remove them from the group they got copied to or prevent users from doing this. This is NOT a global accurance just on the user’s spark who copied the person to another group. Any suggestions on how to fix this?

Thanks