My understanding was that the constitution was only relevant to government action. Since this is a civil lawsuit, the First Amendment should not be relevant, sh

My understanding was that the constitution was only relevant to government action. Since this is a civil lawsuit, the First Amendment should not be relevant, should it? It's like how the 2nd amendment gives you the right to bear arms and the government can't take that away from you but a landlord can keep you from having a gun in your apartment. If this was a criminal case the First Amendment would be relevant (by my understanding) but since it's civil, it's irrelevant.