In the US, government forbidding publication by censorship is called "prior restraint," which has a very narrow scope. Sure you can forbid discussion. In fact,

In the US, government forbidding publication by censorship is called "prior restraint," which has a very narrow scope. Sure you can forbid discussion. In fact, there are some things you legally can't say: state secrets (i.e., agents in harm's way), shout "fire" in a crowded theater, slander or be Geraldo Rivera discussing troops-in-contact battle-plans. https://www.thedailybeast.com/teen-copycat-suicides-are-a-real-phenomenon https://www.thedailybeast.com/teen-copycat-suicides-are-a-re... Also "Influence: The Psychology of Persuasion" by Robert B. Cialdini