"Stephen Miller says Democrats want 'two-tiered system of free speech'"
True enough.

“Goodyear is committed to fostering an inclusive and respectful workplace where all of our associates can do their best in a spirit of teamwork. As part of this commitment, we do allow our associates to express their support on racial injustice and other equity issues but ask that they refrain from workplace expressions, verbal or otherwise, in support of political campaigning for any candidate or political party as well as other similar forms of advocacy that fall outside the scope of equity issues.”
Melissa Monaco, The Goodyear Tire & Rubber Company

Liberals aren't interested in freedom of speech. That includes most of the signers of the Harper's letter. There was some discussion recently of arguments for ending at-will employment, but that didn't last. You can't be fired for being black or gay anymore, but you can still be fired for being a communist, a Democrat, or a Republican.