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To delete security group members you'd want to use a delete method on the following URI: https://<your instance>/api/core/v3/securityGroups/<groupID>/members/<groupMemberID>
The group member IDs are the same as the user's ID (that you'd get from the user's object). You can get all of the group members if you pull the group's resources.members.ref
Hope this helps!
This is super helpful. Thank you!