MVC3 - add a folder to controllers?

I want to learn is it possible to add additional folder to `Controller` folder. My reason is pretty simple: I want to divide my project administration and client sides. Example: I have a controller named `Post` that has actions `Index, Details, Delete, Create, Edit`. I want to make one controller as `user` controller that will consist of `Index, Details` and another controller as `admin` controller that will consist of `Delte, Create, Edit`. Then I will be able to easy distinguish what is what and put admin validation on whole admin class. Another reason is that I want my url for administrating my site to look like `/admin/post/delete`, not `/post/delete`. So is it possible, and if so then what would be the best way to implement this?