What i currently have is the following:

namespace AzureCCCMVC.Controllers
{
  [Authorize(Roles="Admin")]
  public class AdminController : Controller
  {
     //Stuff
  }
}

what I want to do is have roles for each client such as

   Roles  { "DEMOAdmin", "GOOGAdmin" , "MSFTAdmin" }

and be able to Authorize The Client name (from URL) and in that role

I know I am doing a horrible job of explaining this... It is possible that I can have users that are users of several clients but only admin's of one ...