Earl Warren,
United States v. O'Brien (391 U.S. 367…
“ We cannot accept the view that an apparently limitless variety of conduct can be labeled "speech" whenever the person engaging in the conduct intends thereby to express an idea. However, even on the assumption that the alleged communicative element in O'Brien's conduct is sufficient to bring into play the First Amendment, it does not necessarily follow that the destruction of a registration certificate is constitutionally protected activity. ”
