Politician: The legal right to free speech does not protect all speech  For example, it is illegal to shout Fire   in a crowded mall if the only intent is to play a practical joke; the government may ban publication of information about military operations and the identity of undercover agents; and extortion threats and conspiratorial agreements are also criminal acts
The criminalization of these forms of speech is justified, since, although they are very different from each other, they are all likely to lead directly to serious harm
in all but a few cases, restricting speech eventually leads directly to serious harm