So the US government can't punish you for speaking, and they can't punish someone else for speaking on your behalf. They can, however, punish you for speaking in exchange for money, speaking words you don't believe (advertising, lying). They can punish you for trying to brainwash people (the difference between advertising and propaganda is who is speaking and what they get from it, and why). They can punish you for forcing others to listen to your words (my neighbor playing music at night). They can punish you for making unfair deals. Most of this is not usually applied to private speech, but the right to free speech does not prevent it. You cannot be punished for attempting to speak in general, however there are absolutely limits.