GetGroupMembersAD.ps1

# Define LDAP search root, the Global catalog of the domain 
$sLDAPSearchRoot="LDAP://YOUR.CORP.ORG" 
# The Groupname to looking for 
$sGroupName="AD_GROUPNAME"

# The query string 
$sSearchStr ="(&(objectCategory=group)(name="+$sGroupName+"))" 
 
# Get the search object 
$oSearch=New-Object directoryservices.DirectorySearcher($oADRoot,$sSearchStr) 

# Looking for the group 
$oFindResult=$oSearch.FindAll() 

$oGroup=New-Object System.DirectoryServices.DirectoryEntry($oFindResult.Path)

$oGroup.member | Out-GridView