The repository administrator or a user with the Manage Users right can delete groups from the repository. When you delete a group you do not delete the members (either users or groups) of the group.
Deleting a group has the following effects:
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The users who belonged to the group lose the group rights
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All permissions on documents granted by the group and subscriptions via the group are canceled
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The group is removed from the groups to which it belonged
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The group is no longer displayed in the list of groups