JUSTICE MARSHALL delivered the opinion of the Court.
The "filed rate doctrine" prohibits a federally regulated seller of natural gas from charging rates higher than those filed with the Federal Energy Regulatory Commission pursuant to the Natural Gas Act, 52 Stat. 821, as amended, 15 U. S. C. § 717 et seq. (1976 ed. and Supp. III). The question before us is whether that doctrine forbids a state court to calculate damages in a breach-of-contract action...
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