Add List of AD Groups to Multiple User Accounts

#Make multiple user accounts members of a list of AD groups, based on information in a CSV file

$csvPath = "C:\Users\Public\Documents\User_AD_Group.csv" 

$usersAndGroups = Import-Csv -Path $csvPath 

$users = $usersAndGroups | Select-Object -ExpandProperty UserName -Unique 

$groups = $usersAndGroups | Select-Object -ExpandProperty GroupName -Unique 

foreach ($user in $users) { 

    foreach ($group in $groups) { 

        Add-ADGroupMember -Identity $group -Members $user 

    } 

} 

Write-Host "Each user has been added to all listed groups"