How do I make my 3D Text not be visible through objects?

I have some 3D text in my scene, but when I have fog enabled, you can see the text right through the fog. Also, even when I tried putting it behind game objects, the text would still appear. I know it’s getting masked somehow because when I put it underneath my terrain, the text is no longer visible. Does anyone know why this is? I can provide pictures if this information is not clear enough to understand.

http://wiki.unity3d.com/index.php?title=3DText