言論自由這個事從來就是約束政府的。和老板雇不雇你是兩回事。

美國憲法第一修正案

Congressshall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

譯文：國會不得製定關於下列事項的法律：確立國教或禁止信教自由；剝奪言論自由或出版自由；或剝奪人民和平集會和向政府請願伸冤的權利。