14 MOODY v. NETCHOICE, LLC Opinion of the Court discard or downplay. The platforms object that the law thus forces them to alter the content of their expression—a particular edited compilation of third-party speech. See Brief for NetChoice in No. 22–555, pp. 18–34. That controversy sounds a familiar note. We have repeatedly faced the question whether ordering a party to provide a forum for someone else’s views implicates the First Amendment. And we have repeatedly held that it does so if, though only if, the regulated party is engaged in its own expressive activity, which the mandated access would alter or disrupt. So too we have held, when applying that principle, that expressive activity includes presenting a curated compilation of speech originally created by others. A review of the relevant precedents will help resolve the question here. The seminal case is Miami Herald Publishing Co. v. Tornillo, 418 U. S. 241 (1974). There, a Florida law required a newspaper to give a political candidate a right to reply when it published “criticism and attacks on his record.” Id., at 243. The Court held the law to violate the First Amendment because it interfered with the newspaper’s “exercise of editorial control and judgment.” Id., at 258. Forcing the paper to print what “it would not otherwise print,” the Court explained, “intru[ded] into the function of editors.” Id., at 256, 258. For that function was, first and foremost, to make decisions about the “content of the paper” and “[t]he choice of material to go into” it. Id., at 258. In protecting that right of editorial control, the Court recognized a possible downside. It noted the access advocates’ view (similar to the States’ view here) that “modern media empires” had gained ever greater capacity to “shape” and even “manipulate popular opinion.” Id., at 249–250. And the Court expressed some sympathy with that diagnosis. See id., at 254. But the cure proposed, it concluded, collided with the First Amendment’s antipathy to state manipulation of the speech market. Florida, the Court explained,