We don't do prior restraint on speech in the U.S. Only if there's an imminent threat of violence (and that imminence is not interpreted liberally) do we allow

We don't do prior restraint on speech in the U.S. Only if there's an imminent threat of violence (and that imminence is not interpreted liberally) do we allow the government to stop a speaker. If speech eventually leads to violence, we expect law enforcement to deal with it, and there can be consequences after the fact, but not before.