For a given user group and user, there should be a method to determine whether or not the user is part of the user group. This will be useful for reworking permissions in the future, and for the example use case below:
The future MY GROUPS window on the homepage will only load Work Groups that the user is a part of. If the user is part of a user group that is a member of the work group Cardiology (eg. Cardiology Administrators), they should be recognized as a member of Cardiology even if they are not directly on the Members list, and should have Cardiology loaded in their MY GROUPS window.