[443]*443Mr. Justice Douglas
delivered the opinion of the Court.
The State of Georgia by this motion for leave to file a bill of complaint1 seeks to invoke the original jurisdiction of this Court under Art. Ill, § 2 of the Constitution. See Judicial Code § 233,28 TJ. S. C. § 341. The defendants are some twenty railroad companies. On November 6, 1944, we issued a rule to show cause why Georgia should not be permitted to file its bill of complaint. Returns to the rule have been made and oral argument had.
Georgia sues in four capacities, only two of which we need mention: (1) in her capacity as a quasi-sovereign or as agent and protector of her people against a continuing wrong done to them; and (2) in her capacity as a proprietor to redress wrongs suffered by the State as the owner of a railroad and as the owner and operator of various institutions of the State.
The essence of the complaint is a charge of a conspiracy among the defendants in restraint of trade and commerce among the States. It alleges that they have fixed arbitrary and noncompetitive rates and charges for transportation of freight by railroad to and from Georgia so as to prefer the ports of other States over the ports of Georgia. It charges that some sixty rate bureaus, committees, conferences, associations and other private rate-fixing agencies have been utilized by defendants to fix these rates; that no road can change joint through rates without the approval of these private agencies; that this private rate-fixing machinery which is not sanctioned by the Interstate Commerce Act and which is prohibited by the anti-trust Acts has put the effective control of rates to [444]*444and from Georgia in the hands of the defendants. The complaint alleges that these practices in purpose and effect give manufacturers, sellers and other shippers in the North an advantage over manufacturers, shippers and others in Georgia. It alleges that the rates so fixed are approximately 39 per cent higher than the rates and charges for transportation of like commodities for like distances between points in the North. It alleges that the defendants who have lines wholly or principally in the South are generally dominated and coerced by the defendants who have northern roads, and therefore that, even when the southern defendants desire, they cannot publish joint through rates between Georgia and the North when the northern carriers refuse to join in such rates.
It is alleged that the rates as a result of the conspiracy are so fixed as
“(a) to deny to many of-Georgia’s products equal access with those of other States to the national market;
(b) to limit in a general way the Georgia economy to staple agricultural products, to restrict and curtail opportunity in manufacturing, shipping and commerce,.and to prevent the full and complete utilization of. the natural wealth of the State;
(c) to frustrate and counteract the measures taken.by the State to promote a well-rounded agricultural program, encourage manufacture and shipping, provide full employr ment, and promote the general progress and welfare of its people; and
(d) to hold the Georgia economy in a state of arrested development.”
The complaint alleges that the defendants are not citizens of Georgia; that Georgia is without remedy in her own courts,- as the defendants are outside her jurisdiction; that she has no administrative remedy, the Interstate Commerce Commission having no power to afford [445]*445relief against such a conspiracy; that the issues presented constitute a justiciable question.
The prayer is for damages and for injunctive relief.
We will return later to the cause of action which Georgia seeks to allege. It is sufficient at this point to say that for purposes of this motion for leave to file we construe the allegation that defendants have conspired to fix the rates so as to “prefer” the ports of other States over the ports of Georgia as a charge that defendants have conspired to fix rates so as to discriminate against Georgia. And we construe the allegation that the southern defendants are dominated and coerced by the northern roads and cannot publish joint through rates when the northern roads refuse to join as a charge that the northern roads use coercion on the southern roads in the fixing of joint through rates.
Defendants in their returns pray that the motion for leave to file be denied on three grounds: (1) that the complaint presents no justiciable controversy; (2) that the complaint fails to state a cause of action; and (3) that two of the defendants are citizens of Georgia. Leave to file should of course be denied if it is plain that no relief may be granted in the exercise of the original jurisdiction of this Court. See Alabama v. Arizona, 291 U. S. 286, 291-292; Arizona v. California, 298 U. S. 558, 572.
Justiciable Controversy. It is said that the bill does not set forth a justiciable controversy within the rule of Massachusetts v. Mellon, 262 U. S. 447, and Florida v. Mellon, 273 U. S. 12. We take the other view, for we are of the opinion that Georgia as parens patriae and as proprietor of various institutions asserts a claim within judicial cognizance. The complaint of Georgia in those respects is not of a political or governmental character. There is involved no question of distribution of powers between the State and the national government as in Massachusetts v. Mellon and in Florida v. Mellon, supra. And, as we shall de[446]*446velop more fully when we turn to a consideration of the assertion that no cause of action has been stated, we are not asked to resolve a dispute which has been withdrawn from the judiciary or which by the charter of our government has been reposed in departments other than the judiciary. Cf. Coleman v. Miller, 307 U. S. 433, 456, 460. The complaint alleges a conspiracy to restrain trade and commerce through the fixing of rates. The history of restraints of trade makes it plain that these problems present judicial questions with which courts have long dealt.2
It is of course true that Georgia does not have a right to invoke the original jurisdiction of the Court merely because there may be involved a judicial question. It is not enough that a State is plaintiff. The original jurisdiction is confined to civil suits where damage has been inflicted or is threatened, not to the enforcement of penal statutes of a State. Wisconsin v. Pelican Ins. Co., 127 U. S. 265, 297-300. And though the suit is civil, leave to file will be denied where it appears that the suit brought in the name of the State is in reality for the benefit of particular individuals. Oklahoma v. Atchison, T. & S. F. R. Co., 220 U. S. 277; Oklahoma v. Cook, 304 U. S. 387; Jones v. Bowles, 322 U. S. 707. Moreover, Massachusetts v. Mellon and Florida v. Mellon, supra, make plain that the United States, not the State, represents the citizens as parens patriae in their relations to the federal government.
The present controversy, however, does not fall within any of those categories. This is a civil, not a criminal, proceeding. Nor is this a situation where the United States rather than Georgia stands as parens patriae to' the citizens of Georgia. This is not a suit like those in Massachusetts v. Mellon, and Florida v. Mellon, supra, where [447]*447a State sought to protect her citizens from the operation of federal statutes. Here Georgia asserts rights based on the anti-trust laws. The fact that the United States may bring criminal prosecutions or suits for injunctions under those laws does not mean that Georgia may not maintain the present suit. As we have seen, Georgia sues as a proprietor to redress wrongs suffered by it as the owner of a railroad and as the owner and operator of various public institutions. Georgia, suing for her own injuries, is a “person” within the meaning of § 16 of the Clayton Act; she is authorized to maintain suits to restrain violations of the anti-trust laws or to recover damages by reason thereof. Georgia v. Evans, 316 U. S. 159. But Georgia is not confined to suits designed to protect only her proprietary interests. The rights which Georgia asserts, parens patriae, are those arising from an alleged conspiracy of private persons whose price-fixing scheme, it is said, has injured the economy of Georgia. Those rights are of course based on federal laws. The enforcement of the criminal sanctions of these acts has been entrusted exclusively to the federal government. See Georgia v. Evans, supra, p. 162. But when it came to other sanctions Congress followed a different course and authorized civil suits not only by the United States but by other persons as well. And we find no indication that, when Congress fashioned those civil remedies, it restricted the States to suits to protect their proprietary interests. Suits by a State, parens patriae, have long been recognized. There is no apparent reason why those suits should be excluded from the purview of the anti-trust acts.
In determining whether a State may invoke our original jurisdiction in a dispute which is justiciable (Oklahoma v. Cook, supra, p. 393) the interests of the State are not confined to those which are proprietary; they embrace the so-called “quasi-sovereign” interests which in the words of Georgia v. Tennessee Copper Co., 206 U. S. 230, 237, [448]*448are “independent of and behind the titles of its citizens, in all the earth and air within its domain.” In that case this Court enjoined manufacturing companies from discharging noxious gas from their works in Tennessee over Georgia’s territory. It was pointed out that “It is a fair and reasonable demand on the part of a sovereign that the air over its territory should not be polluted on a great scale by sulphurous acid gas, that the forests on its mountains, be they better or worse, and whatever domestic destruction they have suffered, should not be further destroyed or threatened by the act of persons beyond its control, that the crops and orchards on its hills should not be endangered from the same source.” 206 U. S. p. 238. That case followed Missouri v. Illinois, 180 U. S. 208, where Missouri was granted leave to file a bill seeking to enjoin the discharge of sewage into the Mississippi.3 The Court observed that “if the health and comfort of the inhabitants of a State are threatened, the State is the proper party to represent and defend them.” 180 U. S. p. 241. And see New York v. New Jersey, 266 U. S. 296, 301-302. In Kansas v. Colorado, 206 U. S. 46, Kansas was allowed to sue to restrain the diversion of water from the Arkansas River, an interstate stream. The Court in upholding the right of Kansas to maintain the suit stated: “It is not acting directly and solely for the benefit of any individual citizen to protect his riparian rights. Beyond its property rights it has an interest as a State in this large tract of land bordering on the Arkansas River. Its prosperity affects the general welfare of the State. The controversy rises, therefore, above a mere question of local private right and involves a matter of state interest, and must be considered from that standpoint.” 206 U. S. p. 99. And see Colorado v. Kansas, 320 U. S. 383; North Dakota v. Minnesota, 263 [449]*449U. S. 365. In Pennsylvania, v. West Virginia, 262 U. S. 553, Pennsylvania and Ohio were allowed to maintain suits which sought to enjoin West Virginia from interfering with the flow of natural gas from West Virginia to the other states. The Court said:
“The attitude of the complainant States is not that of mere volunteers attempting to vindicate the freedom of interstate commerce or to redress purely private grievances. Each sues to protect a two-fold interest — one as the proprietor of various public institutions and schools whose supply of gas will be largely curtailed or cut off by the threatened interference with the interstate current, and the other as the representative of the consuming public whose supply will be similarly affected. Both interests are substantial and both are threatened with serious injury.
“Each State uses large amounts of the gas in her several institutions and schools, — the greater part in the discharge of duties which are relatively imperative. A break or cessation in the supply will embarrass her greatly in the discharge of those duties and expose thousands of dependents and school children to serious discomfort, if not more. To substitute another form of fuel will involve very large public expenditures.
“The private consumers in each State not only include most of the inhabitants of many urban communities but constitute a substantial portion of the State’s population. Their health, comfort and welfare are seriously jeopardized by the threatened withdrawal of the gas from the interstate stream. This is a matter of grave public concern in which the State, as the representative of the public, has an interest apart from that of the individuals affected. It is not merely a remote or ethical interest but one which is immediate and recognized by law.” 262 U. S. pp. 591-592.
[450]*450It seems to us clear that under the authority of these cases Georgia may maintain this suit as parens patriae acting on behalf of her citizens though here, as in Georgia v. Tennessee Copper Co., supra, p. 237, we treat the injury to the State as proprietor merely as a “makeweight.” The original jurisdiction of this Court is one of the mighty instruments which the framers of the Constitution provided so that adequate machinery might be available for the peaceful settlement of disputes between States and between a State and citizens of another State. See Missouri v. Illinois, supra, pp. 219-224; Virginia v. West Virginia, 246 U. S. 565, 599. Trade barriers, recriminations, intense commercial rivalries had plagued the colonies.4 The traditional methods available to a sovereign for the settlement of such disputes were diplomacy and war. Suit in this Court was provided as an alternative. Missouri v. Illinois, supra, p. 241; Georgia v. Tennessee Copper Co., supra, p. 237.
If the allegations of the bill are taken as true, the economy of Georgia and the welfare of her citizens have seriously suffered as the result of this alleged conspiracy. Discriminatory rates are but one form of trade barriers. They may cause a blight no less serious than the spread of noxious gas over the land or the deposit of sewage in the streams. They may affect the prosperity and welfare of a State as profoundly as any diversion of waters from the rivers. They may stifle, impede, or cripple old industries and prevent the establishment of new ones. They may arrest the development of a State or put it at a decided disadvantage in competitive markets. Such a charge at least equals in gravity the one which Pennsylvania and Ohio had with West Virginia over the curtailment of the flow of natural gas from the West Virginia [451]*451fields. There are substitute fuels to which the economy of a State might be adjusted. But discriminatory rates fastened on a region have a more permanent and insidious quality. Georgia as a representative of the public is complaining of a wrong which, if proven, limits the opportunities of her people, shackles her industries, retards her development, and relegates her to an inferior economic position among her sister States. These are matters of grave public concern in which Georgia has an interest apart from that of particular individuals who may be affected. Georgia’s interest is not remote; it is immediate. If we denied Georgia as parens patriae the right to invoke the original jurisdiction of the Court in a matter of that gravity, we would whittle the concept of justiciability down to the stature of minor or conventional controversies. There is no warrant for such a restriction.
Oklahoma v. Atchison, T. & S. F. R. Co., supra, is not opposed to this view. In that case, the defendant railroad company had obtained a grant from Congress to locate and maintain a railway line through the Indian Territory out of which the State of Oklahoma was later formed. The federal act provided certain maximum transportation rates which the company might charge. Oklahoma sued to cancel the grant, to have the property granted decreed to be in the State of Oklahoma as cestui que trust, to enjoin the defendant from operating a railroad in the State, and to enjoin pendente lite the exaction of greater rates than the maximum rates specified. The Court construed the Act of Congress as subjecting the rates to federal control until the territory became a part of a State, at which time the rates became subject to state control. The Court held that our original jurisdiction could not be invoked by a State merely because its citizens were injured. We adhere to that decision. It does not control the present one. This is no attempt to utilize our orig[452]*452inal jurisdiction in substitution for the established methods of enforcing local law. This is not a suit in which a State is a mere nominal plaintiff, individual shippers being the real complainants. This is a suit in which Georgia asserts claims arising out of federal laws and the gravamen of which runs far beyond the claim of damage to individual shippers.
Since the claim which Georgia asserts as parens patriae as well as proprietor meets the standards of justiciability and since Georgia is a “person” entitled to enforce the civil sanctions of the anti-trust laws, the reasons which have been advanced for denying Georgia the opportunity to present her cause of action to this Court fail.
Cause of Action. It is argued that the complaint fails to state a cause of action. (1) It is pointed out that under the principle of the Abilene case no action for damages on the basis of unjust, unreasonable, or discriminatory railroad rates may be maintained without prior resort to the Interstate Commerce Commission. Texas & Pacific R. Co. v. Abilene Cotton Oil Co., 204 U. S. 426; Great Northern R. Co. v. Merchants Elevator Co., 259 U. S. 285. (2) It is said that an injunction may not be granted to restrain rates alleged to be unreasonable or discriminatory where there has been no prior determination of the matter by the Commission and that the only way a State or any other person may obtain a judicial determination of the legality of a rate is by review of the Commission's order. Baltimore & Ohio R. Co. v. Pitcairn Coal Co., 215 U. S. 481; North Dakota v. Chicago & N. W. R. Co., 257 U. S. 485; Texas v. Interstate Commerce Commission, 258 U. S. 158. (3) It is said that damages under the anti-trust laws may not be recovered against railroad carriers though the rates approved by the Commission were fixed pursuant to a conspiracy. Keogh v. Chicago & N. W. R. Co., 260 U. S. 156. (4) It is said that persons other than the United States are barred from enjoining violations of the anti[453]*453trust laws by virtue of § 16 of the Clayton Act. 38 Stat. 737, 15 U. S. C. § 26. See Central Transfer Co. v. Terminal R. Assn., 288 U. S. 469, 473-475; Terminal Warehouse Co. v. Pennsylvania R. Co., 297 U. S. 500, 513. (5) It is argued that Georgia cannot maintain an action on common law principles based upon a conspiracy among carriers to fix rates.
We think it is clear from the Keogh case alone that Georgia may not recover damages even if the conspiracy alleged were shown to exist. That was a suit for damages under § 7 of the Sherman Act. 26 Stat. 210. The Court recognized that although the rates fixed had been found reasonable and non-discriminatory by the Commission, the United States was not barred from enforcing the remedies of the Sherman Act. 260 U. S. pp. 161-162. It held, however, that for purposes of a suit for damages a rate was not necessarily illegal because it was the result of a conspiracy in restraint of trade. The legal rights of a shipper against a carrier in respect to a rate are to be measured by the published tariff. That rate until suspended or set aside was for all purposes the legal rate as between shipper and carrier and may not be varied or enlarged either by the contract or tort of the carrier. And it added: “This stringent rule prevails, because otherwise the paramount purpose of Congress — prevention of unjust discrimination — might be defeated. If a shipper could recover under § 7 of the Anti-Trust Act for damages resulting from the exaction of a rate higher than that which would otherwise have prevailed, the amount recovered might, like a rebate, operate to give him a preference over his trade competitors.” 260 U. S. p. 163. The reasoning and precedent of that case apply with full force here. But it does not dispose of the main prayer of the bill, stressed at the argument, which asks for relief by way of injunction.
[454]*454It is clear that a suit could not be maintained here to review, annul, or set aside an order of the Interstate Commerce Commission. Congress has prescribed the method for obtaining that relief. It is exclusive of all other remedies, including a suit by a State in this Court. North Dakota v. Chicago & N. W. R. Co., supra; Texas v. Interstate Commerce Commission, supra. The same result obtains where the basis for attacking an order of the Commission is a violation of the anti-trust laws, save in the case where the United States is the complainant. For § 16 of the Clayton Act which gives relief by way of injunction against threatened loss or damage through violation of the anti-trust laws provides that no one except the United States shall be entitled to bring such suits against common carriers subject to the Interstate Commerce Act “in respect of any matter subject to the regulation, supervision, or other jurisdiction” of the Commission. Central Transfer Co. v. Terminal R. Assn., supra, indicates that if Georgia in the present proceeding sought to set aside the rates of the defendants, leave to file would have to be denied. In that case the Commission had approved certain rate schedules which entailed abandoning certain “off-track” stations and the employment by the carriers of a single transfer company to do interstation hauling. The carriers proceeded to make an agreement to carry out the program which had been submitted to the Commission and which was later approved by it. Suit was brought by a private company to enjoin performance of the contract on the ground that it created a monopoly in violation of the anti-trust laws. The Court held that the suit was barred by § 16 of the Clayton Act. The Court pointed out that the purpose of § 16 was “to preclude any interference by injunction with any business or transactions of interstate carriers of sufficient public significance and importance to be within the jurisdiction of the Commission, except when the suit is brought by the Government [455]*455itself.” 288 TJ. S. p. 475. It added (p. 476): “True, a contract may precede and have existence apart from the several acts required to perform it, and conceivably all of those acts might be done if no contract or agreement to perform them had ever existed. But when they are done in performance of an agreement, there is no way by which the agreement itself can be assailed by injunction except by restraining acts done in performance of it. That, in this case, the statute forbids, not because the contract is within the jurisdiction of the Interstate Commerce Commission, but because the acts done in performance of it, which must necessarily be enjoined if any relief is given, are matters subject to the jurisdiction of the Commission.” The policy behind these restrictions placed on suitors by the Congress was aptly stated in Terminal Warehouse Co. v. Pennsylvania R. Co., supra, p. 513, as follows: “If a sufferer from the discriminatory acts of carriers by rail or by water may sue for an injunction under the Clayton Act without resort in the first instance to the regulatory commission, the unity of the system of regulation breaks down beyond repair.” We adhere to these decisions. But we do not believe they or the principles for which they stand are a barrier to the maintenance of this suit by Georgia.
The relief which Georgia seeks is not a matter subject to the jurisdiction of the Commission. Georgia in this proceeding is not seeking an injunction against the continuance of any tariff; nor does she seek to have any tariff provision cancelled. She merely asks that the alleged rate-fixing combination and conspiracy among the defendant-carriers be enjoined. As we shall see, that is a matter over which the Commission has no jurisdiction. And an injunction designed to put an end to the conspiracy need not enjoin operation under established rates as would have been the case had an injunction issued in Central Transfer Co. v. Terminal R. Assn., supra.
[456]*456These carriers are subject to the anti-trust laws. United States v. Southern Pacific Co., 259 U. S. 214. Conspiracies among carriers to fix rates were included in the broad sweep of the Sherman Act. United States v. Trans-Missouri Freight Assn., 166 U. S. 290; United States v. Joint Traffic Assn., 171 U. S. 505. Congress by § 11 of the Clayton Act entrusted the Commission with authority to enforce compliance with certain of its provisions “where applicable to common carriers” under the Commission’s jurisdiction.5 It has the power to lift the ban of the antitrust laws in favor of carriers who merge or consolidate (New York Central Securities Corp. v. United States, 287 U. S. 12, 25-26) and the duty to give weight to the antitrust policy of the nation before approving mergers and consolidations. McLean Trucking Co. v. United States, 321 U. S. 67. But Congress has not given the Commission comparable authority to remove rate-fixing combinations from the prohibitions contained in the anti-trust laws. It has not placed these combinations under the control and supervision of the Commission. Nor has it empowered the Commission to proceed against such combinations and through cease and desist orders or otherwise to put an end to their activities. Eegulated industries are not per se exempt from the Sherman Act. United States v. Borden Co., 308 U. S. 188, 198 et seq. It is true that the Commission’s regulation of carriers has greatly expanded since the Sherman Act. See Arizona Grocery Co. v. Atchison, T. & S. F. R. Co., 284 U. S. 370, 385-386. But it is elementary that repeals by implication are not [457]*457favored. Only a clear repugnancy between the old law and the new results in the former giving way and then only pro tanto to the extent of the repugnancy. United States v. Borden, supra, pp. 198, 199. None of the powers acquired by the Commission since the enactment of the Sherman Act relates to the regulation of rate-fixing combinations. Twice Congress has been tendered proposals to legalize rate-fixing combinations.6 But it has not adopted them. In view of this history we can only conclude that they have no immunity from the anti-trust laws.
It is pointed out, however, that under § 1 (4) of the Interstate Commerce Act (54 Stat. 900, 49 U. S. C. § 1 (4)) it is “the duty of every common carrier subject to this chapter to provide and furnish transportation upon reasonable request therefor, and to establish reasonable through routes with other such carriers, and just and reasonable rates, fares, charges, and classifications applicable thereto.” And it is noted that agreement among carriers is provided in the establishment of joint rates. § 6. That is true. But it would be a perversion of those sections to hold that they legalize a rate-fixing combination of the character alleged to exist here. The collaboration contemplated in the fixing of through and joint rates is of a restrictive nature. We do not stop at this stage of the proceedings to delineate the legitimate area in which that collaboration may operate. In the Keogh case (260 U. S. 156) the suit was one for damages under the Sherman Act. The charge was that the defendant carriers [458]*458had formed a rate bureau or committee to secure agreement in respect to freight rates among the constituent railroad companies which would otherwise be competing carriers. As we have seen, the Court held that damages could not be recovered. But Mr. Justice Brandéis speaking for a unanimous Court stated that a conspiracy to fix rates might be illegal though the rates fixed were reasonable and non-discriminatory. He said (260 U. S. pp. 161-162): “All the rates fixed were reasonable and nondiscriminatory. That was settled by the proceedings before the Commission. . . . But under the Anti-Trust Act, a combination of carriers to fix reasonable and nondiscriminatory rates may be illegal; and if so, the Government may have redress by criminal proceedings under § 3, by injunction under § 4, and by forfeiture under § 6. That was settled by United States v. Trans-Missouri Freight Association, 166 U. S. 290, and United States v. Joint Traffic Association, 171 U. S. 505. The fact that these rates had been approved by the Commission would not, it seems, bar proceedings by the Government.” The Trans-Missouri Freight Assn, case and the Joint Traffic Assn. case have been followed in other fields. United States v. Socony-Vacuum Oil Co., 310 U. S. 150, and the cases which preceded it indicate the extent of the ban on price-fixing under the Sherman Act. But we need not at this juncture determine the full extent to which that principle is applicable in the fixing of joint through rates. It is sufficient here to note that we find no warrant in the Interstate Commerce Act and the Sherman Act for saying that the authority to fix joint through rates clothes with legality a conspiracy to discriminate against a State or a region, to use coercion in the fixing of rates, or to put in the hands of a combination of carriers a veto power over rates proposed by a single carrier. The type of regulation which Congress chose did not eliminate the emphasis on competition and individual freedom of action in rate-[459]*459making. 1 Sharfman, The Interstate Commerce Commission (1931), p. 81. The Act was designed to preserve private initiative in rate-making as indicated by the duty of each common carrier to initiate its own rates. Arizona Grocery Co. v. Atchison, T. & S. F. R. Co., supra. If a combination of the character described in this bill of complaint is immune from suit, that freedom of action disappears. The coercive and collusive influences of group action take its place.7 A monopoly power is created under the aegis of private parties without Congressional sanction and without governmental supervision or control.
These considerations emphasize the irrelevancy to the present problem of the fact that the Commission has authority to remove discriminatory rates of the character alleged to exist here. Under § 3 (1) of the Act rates are declared unlawful which give “any undue or unreasonable preference or advantage” to any port, region, district, territory and the like. And the Commission has taken some action in that regard. See Alabama v. New York C. R. Co., 235 I. C. C. 255; 237 I. C. C. 515; Live Stock to and from the South, 253 I. C. C. 241. The present bill does not seek to have the Court act in the place of the Commission. It seeks to remove from the field of rate-making the influences of a combination which exceed the limits of the collaboration authorized for the fixing of joint through [460]*460rates. It seeks to put an end to discriminatory and coercive practices. The aim is to make it possible for individual carriers to perform their duty under the Act, so that whatever tariffs may be continued in effect or superseded by new ones may be tariffs which are free from the restrictive, discriminatory, and coercive influences of the combination. That is not to undercut or impair the primary jurisdiction of the Commission over rates. It is to free the rate-making function of the influences of a conspiracy over which the Commission has no authority but which if proven to exist can only hinder the Commission in the tasks with which it is confronted.
What we have said disposes for the most part of the argument that recognized principles of equity prevent us from granting the relief which is asked. Sec. 16 of the Clayton Act provides for relief by injunction “when and under the same conditions and principles as injunc-tive relief against threatened conduct that will cause loss or damage is granted by courts of equity.” Those requirements are sufficiently satisfied to justify a filing of this bill. It must be remembered that this is a suit to dissolve an illegal combination or to confine it to the legitimate area of collaboration. That relief cannot be obtained from the Commission for it has no supervisory authority over the combination. It is true that the injury to Georgia is not in the existence of the combination per se but in the rates which are fixed by the combination. The fact that the rates which have been fixed may or may not be held unlawful by the Commission is immaterial to the issue before us. The Keogh case indicates that even a combination to fix reasonable and non-discriminatory rates may be illegal. 260 U. S. p. 161. The reason is that the Interstate Commerce Act does not provide remedies for the correction of all the abuses of rate-making which might constitute violations of the anti-trust laws. Thus a “zone of reasonableness exists between maxima and [461]*461minima within which a carrier is ordinarily free to adjust its charges for itself.” United States v. Chicago, M., St. P. & P. R. Co., 294 U. S. 499, 506. Within that zone the Commission lacks power to grant relief even though the rates are raised to the maxima by a conspiracy among carriers who employ unlawful tactics. If the rate-making function is freed from the unlawful restraints of the alleged conspiracy, the rates of the future will then be fixed in the manner envisioned by Congress when it enacted this legislation. Damage must be presumed to flow from a conspiracy to manipulate rates within that zone.
Moreover, the relief sought from this Court is not an uprooting of established rates. We are not asked for a decree which would be an idle gesture. We are not asked to enjoin what the Commission might later approve or condone. We are not asked to trench on the domain of the Commission; nor need any decree which may be ultimately entered in this cause have that effect. Georgia alleges, “No administrative proceeding directed against a particular schedule of rates would afford relief to the State of Georgia so long as the defendants remained free to promulgate rates by collusive agreement. Until the conspiracy is ended, the corrosion of new schedules, established by the collusive power of the defendant carriers acting in concert, would frustrate any action sought to be taken by administrative process to redress the grievances from which the State of Georgia suffers.” Rate-making is a continuous process. Georgia is seeking- a decree which will prevent in the future the kind of harmful conduct which has occurred in the past. Take the case of coercion. If it is shown that the alleged combination exists and uses coercion in the fixing of joint- through rates, only an injunction aimed at future conduct of that character can give adequate relief. Indeed, so long as the collaboration which exists exceeds lawful limits and continues in operation, the only effective remedy lies in dissolving the [462]*462combination or in confining it within legitimate boundaries. Any decree which is entered would look to the future and would free tomorrow’s rate-making from the coercive and collusive influences alleged to exist. It cannot of course be determined in advance what rates may be lawfully established. But coercion can be enjoined. And so can a combination which has as its purpose an invidious discrimination against a region or locality. Dissolution of illegal combinations or a restriction of their conduct to lawful channels is a conventional form of relief accorded in anti-trust suits. No more is envisaged here. If the alleged combination is shown to exist, the decree which can be entered will be no idle or futile gesture. It will restore that degree of competition envisaged by Congress when it enacted the Interstate Commerce Act. It will eliminate from rate-making the collusive practices which the anti-trust laws condemn and which are not sanctioned by the Interstate Commerce Act. It will supply an effective remedy without which there can be only an endless effort to rectify the continuous injury inflicted by the unlawful combination. The threatened injury is clear. The damage alleged is sufficient to satisfy the preliminary requirements of this motion to file. There is no administrative control over the combination. And no adequate or effective remedy other than this suit is suggested which Georgia can employ to eliminate from rate-making the influences of the unlawful conspiracy alleged to exist here.
As we have said, we construe the bill to charge a conspiracy among defendants to use coercion in the fixing of rates and to discriminate against Georgia in the rates which are fixed. We hold that under that construction of the bill a cause of action under the anti-trust laws is alleged.8 We intimate no opinion whether the bill might [463]*463be construed to charge more than that or whether a rate-fixing combination would be legal under the Interstate Commerce Act and the Sherman Act but for the features of discrimination and coercion charged here. We are dealing with the case only in a preliminary manner. Cf. Missouri v. Illinois, 200 U. S. 496, 517, 518. The complaint may have to be amplified and clarified as respects the coercion and discrimination charged, the damage suffered, or otherwise. We do not test it against the various types of motions and pleadings which may be filed. We construe it with that liberality accorded the complaint of a sovereign State as presenting a substantial question with sufficient clarity and specificity as to require a joinder of issues.
Alleged Misjoinder of Parties Defendant. Two of the defendant-corporations claim to be citizens of Georgia. Georgia asserts they are not. That issue is an involved one. Georgia may not of course invoke the original jurisdiction of the Court in a suit against one of her citizens. If either of the defendants who assert this defense is a citizen of Georgia and is a necessary party, leave to file would have to be denied. Pennsylvania v. Quicksilver Mining Co., 10 Wall. 553; California v. Southern Pacific Co., 157 U. S. 229; Minnesota v. Northern Securities Co., 184 U. S. 199; Louisiana v. Cummins, 314 U. S. 577. We do not, however, have to decide at this stage of the proceedings whether the corporations in question are citizens of Georgia within the meaning of Art. Ill, § 2 of the Constitution. They are not indispensable parties. In a suit to enjoin a conspiracy not all the conspirators are necessary parties defendant.9 It is averred and not challenged [464]*464that the other defendants are citizens of other States. The citizenship of the two defendants in question may be challenged by a motion to strike. Louisiana v. Cummins, 314 U. S. 580. But if they are stricken, the Court would not lose original jurisdiction over the controversy between Georgia and the other defendants.
Exercise of Original Jurisdiction. It does not necessarily follow that this Court must exercise its original jurisdiction. It has at times been held that this Court is not the appropriate tribunal in which to maintain suits brought by a State.
By Clause 1 of § 2 of Article III of the Constitution, the judicial power of the United States extends “to all Cases, in Law and Equity, arising under . . . the Laws of the United States” and “to Controversies . . . between a State and Citizens of another State.” 10 Clause 2 of § 2 of Article III confers on this Court jurisdiction of those cases “in which a State shall be Party.” But Clause 2 of § 2 merely distributes the jurisdiction conferred by Clause 1 of § 2. Louisiana v. Texas, 176 U. S. 1, 16; Massachusetts v. Missouri, 308 U. S. 1, 19. Clause 2 does not grant exclusive jurisdiction to this Court in the cases enumerated by it. Ames v. Kansas, 111 U. S. 449, 469; Plaquemines Fruit Co. v. Henderson, 170 U. S. 511. And it has been held that the exercise of that jurisdiction is not mandatory in every case. North Dakota v. Chicago & N. W. R. Co., supra; Georgia v. Chattanooga, 264 U. S. 472, 483; Oklahoma v. Cook, supra, p. 396; Massachusetts v. Missouri, supra. The Court in its discretion has withheld the exercise of its jurisdiction where there has been no want of another suitable forum to which the cause may be remitted in the interests of convenience, efficiency and jus[465]*465tice. Georgia v. Chattanooga, supra; Massachusetts v. Missouri, supra.
There is some suggestion that the issues tendered by the bill of complaint present questions which a district court is quite competent to decide. It is pointed out that the remedy is one normally pursued in the district courts whose facilities and prescribed judicial duties are better adapted to the extended trial of issues of fact than are those of this Court. And it is said that no reason appears why the present suit may not conveniently proceed in the district court of the proper venue or why the convenience of the parties and witnesses, as well as of the courts, would be better served by a trial before a master appointed by this Court than by a trial in a district court with the customary appellate review.11 The suggestion is that we deny the motion for leave to file, without prejudice to the maintenance of the suit in an appropriate district court. See Massachusetts v. Missouri, supra, pp. 17-18.
There is, however, a reason why we should not follow that procedure here though in other respects we assume it would be wholly appropriate. Sec. 16 of the Clayton Act (15 U. S. C. § 26), with the exceptions already noted, provides that “any person . . . shall be entitled to sue for and have injunctive relief, in any court of the United States having jurisdiction over the parties, against threatened loss or damage by a violation of the antitrust laws.” Sec. 12 of the Clayton Act (15 U. S. C. § 22) provides that “Any suit, action, or proceeding under the antitrust laws against a corporation may be brought not only in the judicial district whereof it is an inhabitant, but also in any district wherein it may be found or transacts business; and all process in such cases may be served in the [466]*466district of which it is an inhabitant, or wherever it maybe found.”
From these provisions it is apparent that Georgia might sue the defendants only in the judicial district where they are inhabitants or where they may be found or transact business. The bill of complaint, however, alleges and (with the exception of the two defendants already mentioned) it is not denied that “the parties defendant are not citizens of Georgia, or within the jurisdiction of its courts.” If that allegation is taken as true, it is apparent that Georgia could not find all of the defendants in one of the judicial districts of Georgia so as to maintain a suit of this character against all of them in a district court in Georgia. Certainly we have no basis for assuming that all of the so-called northern roads, incorporated in such States as Pennsylvania, Maryland, Indiana, Ohio, New York and Illinois, are doing business in Georgia. It is said that most of the defendants can be found in Georgia, in the District of Columbia, or in other districts. But no such facts appear in the record before us. And we cannot take judicial notice of the district or districts wherein all of the defendants are “found” or “transact business.” We would not be warranted in depriving Georgia of the original jurisdiction of this Court merely because each of the defendants could be found in some judicial district. Unless it were clear that all of them could be found in some convenient forum we could not say that Georgia had a “proper and adequate remedy” apart from the original jurisdiction of this Court. Massachusetts v. Missouri, supra, p. 19. No such showing has been made. Once a state makes out a case which comes within our original jurisdiction, its right to come here is established. There is no requirement in the Constitution that it go further and show that no other forum is available to it.
■ It is true that § 5 of the Sherman Act empowers the court before whom proceedings under § 4 are pending to [467]*467bring in parties who reside outside the district in which the court is held.12 That procedure is available in civil suits brought by the United States. Standard Oil Co. v. United States, 221 U. S. 1, 46. But since § 4 is limited to suits brought by the United States, § 5 is similarly confined. See Greer, Mills & Co. v. Stoller, 77 F. 1; Hansen Packing Co. v. Armour & Co., 16 F. Supp. 784, 787. Apart from specific exceptions created by Congress-the jurisdiction of the district courts is territorial. As stated in Robertson v. Railroad Labor Board, 268 U. S. 619, 622-623:
“In a civil suit in personam jurisdiction over the defendant, as distinguished from venue, implies, among other things, either voluntary appearance by him or service of process upon him at a place where the officer serving it has authority to execute a writ of summons. Under the general provisions of law, a United States district court [468]*468cannot issue process beyond the limits of the district, Harkness v. Hyde, 98 U. S. 476; Ex parte Graham, 3 Wash. 456; and a defendant in a civil suit can be subjected to its jurisdiction in personam only by service within the district. Toland v. Sprague, 12 Pet. 300, 330. Such was the general rule established by the Judiciary Act of September 24, 1789, c. 20, § 11, 1 Stat. 73, 79, in accordance with the practice at the common law. Piquet v. Swan, 5 Mason 35, 39 et seq. And such has been the general rule ever since. Munter v. Weil Corset Co., 261 U. S. 276, 279.”
It follows that we should not in the exercise of our discretion remit Georgia to the federal district courts for relief against the injuries of which she complains.
The motion for leave to file the amended bill of complaint is granted.
It is so ordered.