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:
UNITED STATES v. EMPLOYING PLASTERERS ASSOCIATION OF CHICAGO et al.
No. 440.
Argued February 3, 1954.
Decided March 8, 1954.
Charles H. Weston argued the cause for the United States. With him on the brief were Acting Solicitor General Stern, Assistant Attorney General Barnes and Marvin E. Frankel.
Thomas M. Thomas argued the cause for the Employing Plasterers Association of Chicago, appellee. With him on the brief was Howard Ellis. Perry S. Patterson entered an appearance.
Daniel D. Carmell argued the cause and filed a brief for the Journeymen Plasterers’ Protective and Benevolent Society, Local No. 5, et al., appellees.
Mb. Justice Black
delivered the opinion of the Court.
The United States brought this civil action in a Federal District Court charging the defendants (appellees here) with having violated § 1 of the Sherman Act which forbids combinations or conspiracies in restraint of interstate trade or commerce. Holding that the complaint failed to state a cause of action on which relief could be granted under the Act, the District Court dismissed. The case is before us on direct appeal, 15 U. S. C. § 29, and the only question we must decide is whether the District Court’s dismissal was error. We hold it was.
In summary the Government’s complaint alleges:
Defendants are (1) a Chicago trade association of plastering contractors; (2) a local labor union of plasterers and their apprentices; (3) the union’s president. These contractors and union members employed by them do approximately 60% of the plastering contracting business in the Chicago area of Illinois. Materials used in the plastering, such as gypsum, lath, cement, lime, etc., are furnished by the contractors. Substantial quantities of this material are produced in other states, bought by Illinois building materials dealers and shipped into Illinois, sometimes going directly to the place of business of the dealers and sometimes directly to job sites for use by the plastering contractors under arrangements with the dealers. The practical effect of all this is a continuous and almost uninterrupted flow of plastering materials from out-of-state origins to Illinois job sites for use there by plastering contractors. Restraint or disruption of plastering work in the Chicago area thus necessarily affects this interstate flow of plastering materials adversely. Since 1938 the Chicago defendants have acted in concert to suppress competition among local plastering contractors, to prevent out-of-state contractors from doing any business in the Chicago area and to bar entry of new local contractors without approval by a private examining board set up by the union. The effect of all this has been an unlawful and unreasonable restraint of the flow in interstate commerce of materials used in the Chicago plastering industry.
The District Court did not question that the foregoing and other factual allegations showed a combination to restrain competition among Chicago plastering contractors. But the court considered these allegations to be “wholly a charge of local restraint and monopoly,” not reached by the Sherman Act. And the court held that there was no allegation of fact which showed that these powerful local restraints had a sufficiently adverse effect on the flow of plastering materials into Illinois. At this point we disagree. The complaint plainly charged several times that the^ effect of all these local restraints was to restrain interstate commerce. Whether these charges be called “allegations of fact” or “mere conclusions of the pleader,” we hold that they must be taken into account in deciding whether the Government is entitled to have its case tried.
We are not impressed by the argument that the Sherman Act could not possibly apply here because the interstate buying, selling and movement of plastering materials had ended before the local restraints became effective. Where interstate commerce ends and local commerce begins is not always easy to decide and is not decisive in Sherman Act cases. See Mandeville Island Farms v. American Crystal Sugar Co., 334 U. S. 219, 232. However this may be, the complaint alleged that continuously since 1938 a local group of people were to a large extent able to dictate who could and who could not buy plastering materials that had to reach Illinois through interstate trade if they reached there at all. Under such circumstances it goes too far to say that the Government could not possibly produce enough evidence to show that these local restraints caused unreasonable burdens on the free and uninterrupted flow of plastering materials into Illinois. That wholly local business restraints can produce the effects condemned by the Sherman Act is no longer open to question. See, e. g., United States v. Women’s Sportswear Manufacturers Assn., 336 U. S. 460, 464.
The Government’s complaint may be too long and too detailed in view of the modern practice looking to simplicity and reasonable brevity in pleading. It does not charge too little. It includes every essential to show a violation of the Sherman Act. And where a bona fide complaint is filed that charges every element necessary to recover, summary dismissal of a civil case for failure to set out evidential facts can seldom be justified. If a party needs more facts, it has a right to call for them under Rule 12 (e) of the Federal Rules of Civil Procedure. And any time a claim is frivolous an expensive full dress trial can be avoided by invoking the summary judgment procedure under Rule 56.
We hold it was error to dismiss the Government’s complaint for failure to state a cause of action.
This leaves the separate contention of the union that it is immune from prosecution for violation of the Sherman Act because of § 20 of the Clayton Act. This contention has no merit under the allegations of the complaint here because they show, if true, that the union and its president have combined with business contractors to suppress competition among them. Allen Bradley Co. v. Local Union No. 3, 325 U. S. 797.
Reversed.
26 Stat. 209, as amended by 50 Stat. 693, 15 U. S. C. § 1, so far as here relevant reads:
“Every contract, combination in the form of trust or otherwise, or conspiracy, in restraint of trade or commerce among the several States, or with foreign nations, is declared to be illegal . . . .” The complaint here also charged a violation of § 2 of the Sherman Act, but the Government has not pressed that claim here. Cf. Standard Oil Co. v. United States, 337 U. S. 293, 314.

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