Cite as: 515 U. S. 557 (1995)
Opinion of the Court
There is no corresponding concession from the other side, however, and certainly not to the state courts' characterization of the parade as lacking the element of expression for purposes of the First Amendment. Accordingly, our review of petitioners' claim that their activity is indeed in the nature of protected speech carries with it a constitutional duty to conduct an independent examination of the record as a whole, without deference to the trial court. See Bose Corp. v. Consumers Union of United States, Inc., 466 U. S. 485, 499 (1984). The "requirement of independent appellate review . . . is a rule of federal constitutional law," id., at 510, which does not limit our deference to a trial court on matters of witness credibility, Harte-Hanks Communications, Inc. v. Connaughton, 491 U. S. 657, 688 (1989), but which generally requires us to "review the finding of facts by a State court . . . where a conclusion of law as to a Federal right and a finding of fact are so intermingled as to make it necessary, in order to pass upon the Federal question, to analyze the facts," Fiske v. Kansas, 274 U. S. 380, 385-386 (1927). See also Niemotko v. Maryland, 340 U. S. 268, 271 (1951); Jacobellis v. Ohio, 378 U. S. 184, 189 (1964) (opinion of Brennan, J.). This obligation rests upon us simply because the reaches of the First Amendment are ultimately defined by the facts it is held to embrace, and we must thus decide for ourselves whether a given course of conduct falls on the near or far side of the line of constitutional protection. See Bose Corp., supra, at 503. Even where a speech case has originally been tried in a federal court, subject to the provision of Federal Rule of Civil Procedure 52(a) that "[f]indings of fact . . . shall not be set aside unless clearly erroneous," we are obliged to make a fresh examination of crucial facts. Hence, in this case, though we are confronted with the state courts' conclusion that the factual characteristics of petitioners' activity place it within the vast realm of nonexpressive conduct, our obligation is to " 'make an independent examina-
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