How do you revoke or remove management permissions to add or remove members to an Exchange 2007 Distribution group?

I'm having a difficult time finding this solution. I believed it was a Powershell command line syntax, but now I'm not so sure.
All I can find from web searches are how to ADD someone management rights to add or remove distribution list members, but not REMOVE their permissions already set.

This is for Exchange 2007.

I see syntax like this for powershell:

Add-ADPermission -Identity <"group name"> -User <username> -AccessRights WriteProperty -Properties "Member"

which does not get me what I need.

Use study: We have an employee who no longer should be allowed to add or remove email distribution list members. I have been tasked with disabling this person's ability to do so, but am pulling my hair out trying to find it.
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Simon Butler (Sembee)ConsultantCommented:
Remove-Adpermission -Identity group -User username



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