How to Search for Disabled Users in specific groups...

I am attempting to write a script that:

1. Searches our AD for Groups that begin with "AW_"
2. Searches for DISABLED users within "AW_" groups
3. Removes all disabled users from groups that begin with "AW_"

So far I've got step 1 down:

 $AWGroups = Get-ADGroup -Filter {name -like "AW_*"} -Properties Description

Code for step 2 doesn't seem to return all disabled users. It appears to return only one of the disabled users in any of the $AWGroups

foreach ($group in $AWGroups)
{
$DisabledUsers += Get-ADGroupMember -identity $group | get-aduser | Where {$_.Enabled -eq $False}
}

Any suggestions for how to accurately gather all disabled user accounts from $AWGroups into $DisabledUsers?

Thanks