There is no basis in American jurisprudence for a restriction on “shouting fire in a crowded theatre.” The quote is from the majority opinion in Shneck va US, which was overturned and the same Chief Justice wrote both opinions.

Speech not protected by the 1st amendment includes: obscenity, fraud, child pornography, speech integral to illegal conduct, speech that incites imminent lawless action, speech that violates intellectual property law, true threats, and commercial speech such as advertising.

Note that incitement is VERY narrowly defined.