I have a project where I want to group users. So for example, say we have a role of 'King' and a role of 'Subject'. I will have a view where a King can see a listing of all of their subjects. When a new user registers, they will sign up under the name of a King, so they will self-organize as to who they are a subject of.
Is Organic Groups an appropriate module for this functionality? I've watched a few tutorials, and it seems to be about sharing (or actually hiding and providing special access to) content. Here I'm not really so concerned about content, but rather grouping users.
If not Organic Groups, is there a good module for grouping users? This is for Drupal 7.