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.
相反仇恨言论,宣称种族灭绝的言论,如果不是针对特定的个人,是属于宪法保护的言论自由的范畴。
UPenn校长在国会的听证会上的问答问题在于"provided a legalistic answer to a moral question, and that was wrong. "
https://jabberwocking.com/is-calling-for-genocide-protected-speech/?