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:
SACHER v. UNITED STATES.
No. 828.
Decided May 19, 1958.
Hubert T. Delany, Frank J. Donner and Teljord Taylor for petitioner.
Solicitor General Rankin, Assistant Attorney General Tompkins, Philip R. Monahan and Doris H. Spangenburg for the United States.
Per Curiam.
The petition for writ of certiorari to the United States Court of Appeals for the District of Columbia Circuit is granted. Charged in a three-count indictment for violation of R. S. § 102, as amended, 2 U. S. C. § 192, for failure to answer three questions put to him by a subcommittee of the Internal Security Subcommittee of the Senate Committee on the Judiciary, the petitioner, having waived trial by jury, was found guilty on all counts and sentenced to six months’ imprisonment and to pay a fine of $1,000. After the sentence was sustained by the Court of Appeals, 99 U. S. App. D. C. 360, 240 F. 2d 46, this Court, having granted a petition for certiorari, remanded the case, 354 U. S. 930, to the Court of Appeals for reconsideration in light of Watkins v. United States, 354 U. S. 178. On reargument before the Court of Appeals sitting en banc, a divided court again affirmed the conviction. 102 U. S. App. D. C. 264, 252 F. 2d 828.
The broad scope of authority vested in Congress to conduct investigations as an incident to the “legislative Powers” granted by the Constitution is not questioned. See Watkins v. United States, supra, at 215. But when Congress seeks to enforce its investigating authority through the criminal process administered by the federal judiciary, the safeguards of criminal justice become operative. The subject matter of inquiry before the subcommittee at which petitioner appeared as a witness concerned the recantation of prior testimony by a witness named Matusow. In the course of the hearing, the questioning of petitioner entered upon a “brief excursion,” 99 U. S. App. D. C. 360, 367, 240 F. 2d 46, 53, into proposed legislation barring Communists from practice at the federal bar, a subject not within the subcommittee’s scope of inquiry as authorized by its parent committee. Inasmuch as petitioner’s refusal to answer related to questions not clearly pertinent to the subject on which the two-member subcommittee conducting the hearing had been authorized to take testimony, the conditions necessary to sustain a conviction for deliberately refusing to answer questions pertinent to the authorized subject matter of a congressional hearing are wanting. Watkins v. United States, supra. The judgment of the Court of Appeals is therefore reversed and the cause remanded to the District Court with directions to dismiss the indictment.
Reversed.
Mr. Justice Burton 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: 6