opinion: 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.