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:
ROBERTS v. UNITED STATES DISTRICT COURT FOR THE NORTHERN DISTRICT OF CALIFORNIA et al.
No. 2, Misc.
Argued March 31, 1950.
Decided June 5, 1950.
Max Radin, acting under an assignment by the Court, argued the cause and filed a brief for petitioner.
No appearance for respondents.
Per Curiam.
Petitioner, who is confined in a California state prison, sought to file a petition in forma pauperis for a writ of injunction in the District Court below. That court denied leave to proceed in forma pauperis, holding that petitioner was not entitled to the benefits of 28 U. S. C. § 1915 because he was no longer a “citizen” as required by that section. The District Court reached that decision in reliance on California Penal Code § 2600, which provides that one sentenced to imprisonment for a term of years is deprived of his civil rights for the period of imprisonment. The decision of the District Court is in error. Citizenship for the purpose of in forma pauperis proceedings in the federal courts is solely a matter of federal law. Congress has not specified criminal convictions, except for desertion and treason, as grounds for loss of citizenship. 8 U. S. C. § 801.
Petitioner thereafter filed a motion in the Court of Appeals for the Ninth Circuit for allowance of an appeal from the order of the District Court. The denial by a District Judge of a motion to proceed in forma pauperis is an appealable order. 28 U. S. C. § 1291; see Cohen v. Beneficial Industrial Loan Corp., 337 U. S. 541 (1949). The Court of Appeals, however, held that it had “no power to grant an application for allowance of an appeal,” and dismissed the petition.
Finally, petitioner filed in this Court a motion for leave to file a petition for a writ of mandamus to the District Court. Mandamus is an extraordinary remedy, available only in rare cases. Ex parte Collett, 337 U. S. 55, 72 (1949), and cases there cited. Because of the ambiguous state of this record, and the fact that a denial of this motion will not prejudice petitioner in further attempts to proceed in forma pauperis, the motion must be denied.
It is so ordered.
Mr. Justice Frankfurter took no part in the consideration or decision of this case.

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