If the government pays a burglar to break into your house to see what you have, then the police use that evidence to arrest you, they have just violated your right to be free from unreasonable search and seizure.
If the government pays a private contractor to burn down your church, or throw you in prison, or even prevent you from publishing books, your rights have been violated. It doesn’t matter if a business did it, especially if they did it at the behest of the government. If the government and businesses work together to deprive their citizens of rights, that is fascism. In fact, that is EXACTLY what Mussolini did.
With all that being said, the Biden administration has passed a regulation that bans the sale or distribution of books written by certain people, and they are getting the world’s largest book seller to enforce it.
This is a clear violation of the First Amendment, and was even used as an example during oral arguments in the Heller case. It was Chief Justice Roberts who asked “Would it be constitutionally acceptable for a municipality to ban books as long as newspapers—a viable substitute source of expression—were still legal?” The answer is no, of course.
How far we have come since then.