code: def _RemoveUsers(self, remove_users):
      
      for username in remove_users:
        self.utils.RemoveUser(username)
        self.user_ssh_keys.pop(username, None)
      self.invalid_users -= set(remove_users)
docs: Deprovision Linux user accounts that do not appear in account metadata.
  
      Args:
        remove_users: list, the username strings of the Linux accounts to remove.