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:
BROTHERHOOD OF LOCOMOTIVE FIREMEN & ENGINEMEN et al. v. BANGOR & AROOSTOOK RAILROAD CO. et al.
No. 353.
Decided December 11, 1967.
Joseph L. Rauh, Jr., John Silard, Harriett R. Taylor, Isaac N. Groner, Harold C. Heiss, Donald W. Bennett, Alex Elson, Willard J. Lassers and Aaron S. Wolff for petitioners.
Francis M. Shea, Richard T. Conway, James R. Wolfe and Charles I. Hopkins, Jr., for respondents.
Per Curiam.
The order of December 4, 1967, denying the petition for a writ of certiorari is vacated.
This case is a consequence of a dispute with respect to the scope of an arbitration award governing the manning of trains and engines in freight service. The union took the position that the award had no effect after 12:01 a. m., March 31, 1966. On March 28, the District Court for the District of Columbia issued a temporary restraining order forbidding a strike. On March 31, the union struck against a number of railroads. The District Court entered contempt orders, imposing substantial fines for alleged violation of its restraining order. The Court of Appeals ruled on various legal issues presented to it but remanded to the District Court to consider whether there had in fact been a contempt, and, also, if there was á contempt, whether it was “of such magnitude as to warrant retention, in part or to any extent, of the coercive fine originally provided for in contemplation of an outright refusal to obey.”
Petitioners seek certiorari to review the adverse rulings made by the Court of Appeals. However, because the Court of Appeals remanded the case, it is not yet ripe for review by this Court. The petition for a writ of certiorari is denied. See Hamilton Shoe Co. v. Wolf Brothers, 240 U. S. 251, 257-258 (1916).
Mr. Justice Black would grant the petition and set the case for argument.

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: 2