What follows is an opinion from the Supreme Court of the United States. Your task is to determine the bases on which the Supreme Court rested its decision with regard to the legal provision that the Court considered in the case. Consider "judicial review (national level)" if the majority determined the constitutionality of some action taken by some unit or official of the federal government, including an interstate compact. Consider "judicial review (state level)" if the majority determined the constitutionality of some action taken by some unit or official of a state or local government. Consider "statutory construction" for cases where the majority interpret a federal statute, treaty, or court rule; if the Court interprets a federal statute governing the powers or jurisdiction of a federal court; if the Court construes a state law as incompatible with a federal law; or if an administrative official interprets a federal statute. Do not consider "statutory construction" where an administrative agency or official acts "pursuant to" a statute, unless the Court interprets the statute to determine if administrative action is proper. Consider "interpretation of administrative regulation or rule, or executive order" if the majority treats federal administrative action in arriving at its decision.Consider "diversity jurisdiction" if the majority said in approximately so many words that under its diversity jurisdiction it is interpreting state law. Consider "federal common law" if the majority indicate that it used a judge-made "doctrine" or "rule; if the Court without more merely specifies the disposition the Court has made of the case and cites one or more of its own previously decided cases unless the citation is qualified by the word "see."; if the case concerns admiralty or maritime law, or some other aspect of the law of nations other than a treaty; if the case concerns the retroactive application of a constitutional provision or a previous decision of the Court; if the case concerns an exclusionary rule, the harmless error rule (though not the statute), the abstention doctrine, comity, res judicata, or collateral estoppel; or if the case concerns a "rule" or "doctrine" that is not specified as related to or connected with a constitutional or statutory provision. Consider "Supreme Court supervision of lower federal or state courts or original jurisdiction" otherwise (i.e., the residual code); for issues pertaining to non-statutorily based Judicial Power topics; for cases arising under the Court's original jurisdiction; in cases in which the Court denied or dismissed the petition for review or where the decision of a lower court is affirmed by a tie vote; or in workers' compensation litigation involving statutory interpretation and, in addition, a discussion of jury determination and/or the sufficiency of the evidence.

Opinion:
PERKINS v. STANDARD OIL CO. OF CALIFORNIA
No. 1507.
Decided June 23, 1970
Together with No. 1556, Perkins v. Standard Oil Co. of California, on petition for writ of certiorari to the same court.
Per Curiam.
Following his success in this Court in Perkins v. Standard Oil Co., 395 U. S. 642, the petitioner filed in the District Court for the District of Oregon an application for allowance of attorneys’ fees, pursuant to § 4 of the Clayton Act, for legal services performed during the appellate stages of that litigation, both in the Court of Appeals and in this Court. The District Court denied the application, ruling that § 4 did not authorize the allowance of attorneys’ fees for services performed in connection with appellate proceedings.
Petitioner appealed this decision to the Court of Appeals and simultaneously filed in that court two separate applications for attorneys’ fees for legal services performed there and in this Court. The Court of Appeals denied the latter application, believing that our mandate in Perkins, by not mentioning attorneys’ fees, was intended to preclude an award of such fees.
The District Court was in error in holding that § 4 does not authorize the award of counsel fees for legal services performed at the appellate stages of a successfully prosecuted private antitrust action. Both the language and purpose of § 4 make that construction untenable. See American Can Co. v. Ladoga Canning Co., 44 F. 2d 763, cert. denied, 282 U. S. 899. The amount of the award for such services should, as a general rule, be fixed in the first instance by the District Court, after hearing evidence as to the extent and nature of the services rendered. See, e. g., Osborn v. Sinclair Refining Co., 207 F. Supp. 856, 864. The Court of Appeals was also in error in interpreting our mandate as precluding the award of such fees for services performed in connection with the litigation in this Court. Our failure to make explicit mention in the mandate of attorneys’ fees simply left the matter open for consideration by the District Court, to which the mandate was directed.
The petitions for certiorari are granted and the judgments are vacated. No. 1556 is remanded to the District Court, and No. 1507 to the Court of Appeals, for further proceedings consistent with this opinion.
It is so ordered.
Mr. Justice Harlan took no part in the consideration or decision of these cases.
That section provides in pertinent part as follows:
“Any person who shall be injured in his business or property by reason of anything forbidden in the antitrust laws may sue therefor in any district court of the United States . . . and shall recover threefold the damages by him sustained, and the cost of suit, including a reasonable attorney’s fee.” 38 Stat. 731, 15 U. S. C. § 15.

Question: What is the basis of the Supreme Court's decision?

Choices:
judicial review (national level)
judicial review (state level)
Supreme Court supervision of lower federal or state courts or original jurisdiction
statutory construction
interpretation of administrative regulation or rule, or executive order
diversity jurisdiction
federal common law

Answer: 3