Which court case affirmed a person's right to free speech?

The case that is most notable for affirming a person's right to free speech is Tinker v. Des Moines. In this landmark decision, the Supreme Court ruled that students in public schools do not "shed their constitutional rights to freedom of speech or expression at the schoolhouse gate." This established that students are entitled to express themselves freely, as long as their actions do not disrupt the educational process.

The other options, while they may touch on aspects of free speech in various contexts, do not primarily focus on the affirmation of this fundamental right in the same way Tinker v. Des Moines does. For example, New York Times v. United States is known for upholding freedom of the press, particularly concerning prior restraint, and Texas v. Johnson addressed symbolic speech related to flag burning. These cases are significant; however, Tinker v. Des Moines specifically reinforced the application of free speech rights in a school environment.