User replication from OU to Security Group

Hi Guys,

 I want to add all my OU members to add into new security group.

Get-ADuser -SearchBase 'OU=India,DC=study,DC=com' -filter *| % {Add-ADGroupMember 'New_Group' -Members $_.DistinguishedName }

If I run this script in power shell, it automatically adding all OU=India users to Security group called 'New_Group'

But Unfortunately when i created a new user in OU=India, Its not replicating to Security group called 'New_Group'

I have to run the above script again to update the newly created OU users to add New_Group.

Is there any script that automate the process when i create the user in OU it should also automatically replicate to security group.

Please Help..Thank you

Ram