Add/Remove Groups

I want to be able to add and remove groups from users (or users from groups
depending on your perspective) from within a .NET application.  The users
will be part of a domain and the user wanting to add/remove groups will be
an admin.

I can find the user name and SID by searching the directory server, but I
can't figure out how to add/remove the groups.

I can use LogonUser() to get the access token, and then get the
WindowsIdentity(), but that requires that I have the user's password.

Does anyone know how to do this without having each user's password?

Thanks,
-Mont

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