What political faction demanded that freedom of the press be amended into the constitution?

The political faction that demanded the inclusion of freedom of the press in the Constitution was primarily the Anti-Federalists. They were concerned about the potential for government overreach and the infringement of individual rights. The Anti-Federalists advocated for a Bill of Rights, which ultimately led to the First Amendment's protection of freedom of the press. Their efforts were crucial in ensuring that this fundamental right was explicitly recognized in the Constitution.