$Objects = @()

$Object = New-Object system.object
$Object | Add-Member -Type NoteProperty -Name alpha -value "X"
$Object | Add-Member -Type NoteProperty -Name Num -value "1"
$Objects += $Object

$Object = New-Object system.object
$Object | Add-Member -Type NoteProperty -Name alpha -value "X"
$Object | Add-Member -Type NoteProperty -Name Num -value "2"
$Objects += $Object

$Object = New-Object system.object
$Object | Add-Member -Type NoteProperty -Name alpha -value "Y"
$Object | Add-Member -Type NoteProperty -Name Num -value "1"
$Objects += $Object

$Object = New-Object system.object
$Object | Add-Member -Type NoteProperty -Name alpha -value "Y"
$Object | Add-Member -Type NoteProperty -Name Num -value "2"
$Objects += $Object

$cAlphas = $Objects | select alpha 
$cAlphas | Sort-Object -Unique

$cAlphas | Sort-Object -Property alpha -Unique

$Results = New-Object system.Collections.ArrayList
$Results.Add("IMP_Trn_Project_Agent_6,User1")
$Results.Add("IMP_Trn_Project_Agent_6,User2")
$Results.Add("IMP_Trn_Project_Agent_6,User3")

$Remove = New-Object system.Collections.ArrayList
$Remove.Add("User2")