I'm trying to get members that belong to a particular group (security groups I've created) and a particular Team (Team is a decorated field of Member).

I can get all the users of a group using:

function MemberList(){
      $group = DataObject::get_one("Group", "Title = '$this->GroupName'"); //GroupName is a field on the page that I make the same as the security group
      $members = $group->Members();
   return $members;

How can I refine the results to also filter by Team?

Thanks,
Brian