delivered the. opinion of the Court.
The respondents, claiming to be the owners of a perpetual franchise to collect tolls for the use of a bridge across, the Canadian River, brought suit in the United States District Court against the members of the State Highway Commission of Oklahoma, the Attorney General of that State, the County Attorneys of McClain and Cleveland Counties, and other persons, residents of the neighborhood, to restrain a threatened interference with the maintenance of the bridge or the collection of tolls. The jurisdiction of the federal court was invoked upon the ground of diversity of citizenship.. The defendants (petitioners in this court) made. a motion, without answering, to dismiss the complaint. The complainants moved at the same time for an injunction pendente lite. The District Court denied the motion for an injunction, and granted the motion to dismiss. The Circuit Court of Appeals for the Tenth Circuit reversed the decree and directed judgment -in favor of the complainants for the relief demanded in the complaint. 58 F. (2d) 41. A writ of certiorari brings the case here.
The facts exhibited in the bill are these. On April 22, 1911, the County. Commissioners of McClain County, Oklahoma, adopted a resolution whereby there was granted to Carter and Halsell, or their assigns, a franchise to construct and operate a toll bridge across the Canadian River at the City of Purcell, the bridge to be erected within the time prescribed by law. The tolls enumerated in a *54 schedule were not to be increased “ by the bridge company,” though they might be reduced. By the terms of the resolution, the grant was to be “ perpetual,” subject only to siich- limitations as were provided by' law. The grantees were to be at liberty to transfer their rights and privileges to “ any individual or corporation,” with' the same effect as if the grant had been made to the assigns directly. On May Iff, 1911, the County Commissioners of Cleveland County on the other side of the Canadian River adopted' a like resolution for. the. grant of a like franchise to the same grantees. On May 18, 1911, Carter, one of the grantees, together with Walling and Hamili,.the present respondents, caused a corporation, known as the Purcell-Lexington Toll Bridge Company, to be organized under the laws of Oklahoma, with a corporate life of- twenty years. Thereafter in December, 1911, while the bridge was in course of construction-, the grantees of the franchises, together with the.respondents, conveyed the bridge, its approaches and all the rights and privileges embraced within the franchises or either of them to the Purcell-Lexington Toll . Bridge Company, its successors and assigns. The corporate life of the Purcell-Lexington Toll Bridge Company was to expire, as we have seen, on May 18, 1931. Before that time, and on April 2, 1931, the bridge company conveyed to the respondents and to Car-. ter, and their assigns, the bridge and the accompanying franchises, the respondents receiving afterwards, from ■ Carter an assignment of his interest, whatever it might be. Thereupon the defendants, who are the petitioners here, gave notice that on May 18, 1931, the bridge would become a free bridge and part of .the free highway system . of the State of Oklahoma. The members of the State Highway Commission, the Attorney Genéral, the County Attorneys, as well as the neighboring residents, who, it séems,-.are also the County Commissioners, announced a purpose to prevent the collection of tolls by the respond *55 ents, and to cause the bridge to be kept open for free and unimpeded passage. This suit for an injunction followed.
The District Court held that the County Commissioners were without authority to grant a franchise, to individuals except in trust for a corporation organized under the bridge law; that the term of the corporate life was also the limit of the duration of the privilege to charge and levy tolls; that a perpetual franchise, if intended, would be void under Article II, § 32 of the Constitution of Oklahoma, prohibiting “ perpetuities ”; and that the bill should be dismissed. The Circuit Court of Appeals, in reversing this judgment, held that the franchises were not invalid because granted to individuals; that upon assignment to a corporation organized for a term of twenty years, the franchises were not cut down in respect of their duration, but continued in full force when conveyed by the assignee to others; that the term “perpetuities” as used in Article II, § 32 of the Constitution of Oklahoma had in view the creation of future estates and did not limit the enjoyment of a privilege or franchise; and that the complainants should have an injunction as prayed for in the bill.
Article II, § 32 of the Constitution of Oklahoma provides: “ Perpetuities and monopolies are contrary to the genius of a free government and shall never be allowed, nor shall the law of. primogeniture or entailment ever be in force in this state.” Construing that provision the Court of Appeals said: “ We do not doubt that the word * perpetuities ’ . . . was not intended to mean or be equivalent to perpetual franchises, but was intended to limit the power to pass titles that would vest
in futuro.”
But the Supreme Court of Oklahoma has not circumscribed the word so narrowly. It has said that a forbidden perpetuity is created when there is granted to an individual or corporation a perpetual privilege or franchise
*56
It has gone farther: it has said that a privilegé or franchise is perpetual "if indefinite in duration, though it be subject to revocation at the pleasure of the legislature. The question caifle before the court in
Okmulgee,
v.
Okmulgee Gas Co.,
We do not now determine what meaning we would give to the Oklahoma Constitution if the question were before us as an original one, unhampered by any pronouncement of the courts of that state. Much can be said in support of the respondents’ position that the perpetuities denounced are those arising from the creation of future
*57
estates or from restraints upon alienation without reasonable limit. The question is one distinctively local in origin and content. The prohibition is embodied in the local Constitution. Not only that, but it is designed to give effect to “ the genius ” of the government, an impalpable existence that can best be apprehended and defined by perceptions and experiences sharpened and developed through the associations of the vicinage. .“In a case involving local history, as this does, we should be slow to overrule the decision of courts steeped in the local tradition, even if we saw reason for doubting it.”
Jackman
v.
Rosenbaum Co.,
We are urged by the respondents to exert a power of independent judgment though the law to.be interpreted be a constitution or a statute, and not merely the form of
*58
law which has come, to be spoken of as general. Cf.
Burgess
v.
Seligman,
Choice is not so free as the. argument assumes. If the single decision interpreting a constitution or a statute is clear and unequivocal, submission to its holding has developed in these days into a practice so nearly uniform that there is little heed to consider whether under pressure of extraordinary circumstances there is a privilege to deviate. Whatever doubt as to the practice may have prevailed in days gone by has been dispelled by recent judgments.
Chicago, M., St. P. & P. R. Co.
v.
Risty, supra; Sioux County
v.
National Surety Co., supra.
Indeed the.' radiating potencies of a decision may go beyond the actual holding. A wise, comity has decreed that deference shall at times be owing, though there may be lacking, in the circumstances, a strict duty of obedience. Cf.
Sim
v.
Edenborn,
The case thus far has been considered from the viewpoint of the substantive law, the basic rights and duties contested by the litigants. There is another path of approach that brings us to the same goal, an approach along (he line of the law of equitable remedies. Caution and reluctance there must be in any case where there is the threat of opposition, in respect of local controversies, between, state and federal courts. Caution and reluctance there must be in special measure where relief, if granted, is an interference by. the process, of injunction with the activities of state officers discharging in good faith their supposed official duties. In such circumstances this court ■has said that an injunction ought not to issue “ unless in a case reasonably free from doubt.”
Massachusetts State Grange
v.
Benton,
272 U. S.
525, 527.
The rule has been characterized as an “ important ” one, to be “ very strictly observed.”
What has been written has had its basis-in the assumption that an indeterminate franchise is a perpetuity within the meaning of the Constitution of Oklahoma, or at the very least that state officers acting in that belief .are not subject to. aii injunction at the instance of the federal courts. The case for the respondents would be beset, however, with other doubts and difficulties -if all these were *62 to be removed. There would still remain the uncertainty whether the franchise granted by the county was to the grantees for their own use or for the use of a corporation to be organized thereafter; whether the corporation was to be one under the “ Wagon Road ” law, with an indeterminate duration, or under the “Bridge Companies” act, with a duration of twenty years; and whether the public policy of Oklahoma, disclosed by her statutes and decisions, and irrespective of decisions elsewhere, sets a limit upon the toll right, or whát is known as the secondary franchise, coterminous with the primary franchise to exist and engage in business in a corporate capacity. By the statement of these questions we convey no hint as to the answer. We do no more than emphasize the complexities of law as well as of policy in which the .respondents’ title is involved, and the unwisdom of superseding the official acts and powers of the agents of the vicinage by writ out of a federal court.
The decree of the Circuit Court of Appeals must be reversed, and the judgment of the District Court dismissing the complaint affirmed. Reversed.
