Only that expression that is shown to belong to a few narrow categories of speech is not protected by the First Amendment. The categories of unprotected speech include obscenity, child pornography, defamatory speech, false advertising, true threats, and fighting words.
相反仇恨言論,宣稱種族滅絕的言論,如果不是針對特定的個人,是屬於憲法保護的言論自由的範疇。
UPenn校長在國會的聽證會上的問答問題在於"provided a legalistic answer to a moral question, and that was wrong. "
https://jabberwocking.com/is-calling-for-genocide-protected-speech/?