Your code does not am,ke sense. You cannot pipe that to Get-Content.
You need to learn basic PowerShell before trying to ask a question in this forum. We cannot guess at what you are asking because you are not asking a legitimate question.
The following gets all accounts that are a members of a group.
Get-ADGroup BlockCiscoVPN | Get--AdGroupMember
You need to read the help for each CmdLet that you want to use. Just guessing based on something you have seen is not useful.
\_(ツ)_/