Is it legal for religious nuts to shove propaganda under my door?

First of all, I'm afraid to go to answer my door early in the morning because it's almost always a bible thumper, which is just ridiculous. Never have I been more chagrined to be the proud owner of a beautiful door with a big glass pane in the middle of it. But now, not only are they waking me up at ungodly hours of the morning (ungodly for someone with my hours, anyway), they've started pushing fliers into my house through the door jamb. There must be some sort of law against that, right?