in Communication Ethics
It is often pointed out that the First Amendment does not let you force someone to listen. It is also worth pointing out that the First Amendment does not let you force someone else to speak.
Which reminds me, when and if I ever get to fully revising Communication Ethics, I ought to include something about this inability to compel others. (I have also finally figured out how to handle P2P issues in the context of that essay but have not had time to write it.)