The article is here; here's the Introduction:
The centennial of Gitlow v. New York is upon us. Gitlow is typically praised as an essential step in the development of modern First Amendment doctrine, so that it is said that "[f]ew individual stars shine as brightly in the constellation of American civil liberties cases." Yet, closely examined, Gitlow seems a puzzling choice for constitutional canonization.
Decided at a time when there were virtually no First Amendment protections for speech, Gitlow held that government could punish mere abstract advocacy of violent revolution. Over the dissenting votes of Oliver Wendell Holmes, Jr. and Louis Brandeis, Gitlow stood for the proposition that "a State in the exercise of its police power may punish those who abuse" freedom of speech "by utterances inimical to the public welfare, tending to incite to crime, disturb the public peace, or endanger the foundations of organized government and threaten its overthrow by unlawful means." It would not be too much of an exaggeration to characterize Gitlow as "the clearest expression of the Supreme Court's acceptance of seditious libel."
Modern First Amendment doctrine, by contrast, is founded on the fundamental axiom that the state may not punish seditious libel. If we now celebrate Gitlow, therefore, it is certainly not for its articulation of the substance of First Amendment protections. It must rather be because Gitlow construed the liberty interests protected by the Due Process Clause of the Fourteenth Amendment, which apply as against the States, to include free speech protections analogous to those protected by the First Amendment, which apply as against the federal government. "The precise question presented, and the only question which we can consider under this writ of error," Gitlow states, is "whether the statute, as construed and applied in this case, by the State courts, deprived the defendant of his liberty of expression in violation of the due process clause of the Fourteenth Amendment."
We are now apt to interpret this language through the lens of incorporation doctrine, which conceives the Due Process Clause of the Fourteenth Amendment as transparently reproducing the exact doctrines of the First Amendment "jot-for-jot and case-for-case." But any such conception of incorporation developed well after Gitlow, which understood itself instead to be explicating the specific nature of the liberty protected by the Fourteenth Amendment. The question in Gitlow was not what the First Amendment required; it was instead what was required by the liberty interests safeguarded by the Due Process Clause.