Mr. Justice Frankfurter
delivered the opinion of the Court.
This case is before us to determine the constitutionality of a Florida statute entitled "Uniform Law to Secure the Attendance of Witnesses from Within or Without a State in Criminal Proceedings." Fla. Stat., 1957, § 942.01-942.06. Respondent, a citizen of Illinois, had traveled to Florida to attend a convention. . In accordance with the Florida statute, the Circuit Court of Dade County, Florida, responded to. a certificate executed by a judge of the Court of General Sessions, New York County (under N. Y. Code Crim. Proc. § 618-a), by summoning' respondent before it to determine whether he was to be given into the custody of New York authorities to be transported to New York to. testify in a grand jury proceeding in that State. The Circuit Court, ruling that the Florida statute violated the Florida and the United States Constitutions, refused to grant New York's request. 9 Fla. Supp. 153. The Supreme Court of Florida affirmed this decision on the ground that the statute violated the United States Constitution. 100 So. 2d 149. We granted certiorari, 356 U. S. 972, inasmuch as this holding brings into question the constitutionality of a statute now in force in forty-two States and the Commonwealth of Puerto Rico. (Thirty-mne States and Puerto Rico joined in an amici brief in support of thé Uniform Act.) The certificate filed with the Circuit Court of Dade' County recites that respondent's testimony is desired by a New York County grand jury. That certificate is, under the terms of the statute, "prima facie evidence of all the facts stated therein." Fla. Stat., 1957, §942.02 (2). Therefore, on the face of the record, respondent's attendance at a grand jury investigation in New York is required by the certificate filed with the Florida court and not withdrawn from it. Neither party has suggested that this is not a live litigation nor do we find any ground for deeming the case to be moot.
The Uniform Act as enacted by the Florida Legislature in 1941 was formulated by the National Conference of Commissioners on Uniform State Laws in its present form in 1936. See Handbook of the National Conference of Commissioners on Uniform State Laws 333 (1936); 9 U. L. A; 91 (1957). The Uniform Act is reciprocal. It is operative only bétween States which have enacted it or similar legislation for compelling of witnesses to travel to, and testify in, sister States.
The terms of the statute make quite clear the procedures to be followed. The judge of the court of the requesting State files in any court of record in the State in which the witness may be found a certificate stating the necessity of the appearance of such witness in a criminal prosecution or grand jury investigation in the requesting State. The certificate must also state the number of days the witness would be required to attend. Upon receipt of such a certificate , a hearing is held by the court in which it is filed. In the hearing, at which under the Florida Act the witness.is entitled to counsel, the court which received this certificate is obliged to determine whether, an order to attend the prosecution or grand jury investigation in the requesting State would comply with conditions.set forth in the statute: that the witness is material and necessary; that the trip to the requesting State would not involve undue hardship to the witness; that the laws of the requesting State and States through which the witness must travel grant him immunity from arrest and the service of civil and criminal process. Fur thermore, the statute provides that the witness must be tendered ten cents a mile for each mile to and from the requesting State and five dollars for each day that he is required to travel and attend as a witness. Under the statute the order of the forwarding State to the witness may take two forms: first, the court may .issue a summons directing the witness to attend and testify in the requesting State; second, if the certificate of the requesting State so recommends, and if the recommendation is found to be desirable by the court of the forwarding State, the court may immediately deliver the witness, to an officer of the requesting State. Furthermore,. if such a recommendation is made by the requesting State, instead of the initial notification of hearing the court of the forwarding State may take the witness into immediate custody. Whether the procedure be by notification and then summons or by apprehension and then delivery, the hearing and the issues to be determined therein are the' same.
In Commonwealth of Kentucky v. Dennison, 24 How. 66, Mr. Chief Justice Taney, speaking of the Obligation imposed by the Constitution upon the Governor of Ohio to deliver to Kentucky one accused of violátion of the criminal laws of Kentucky, called attention "to the obvious policy and necessity of this provision to preserve harmony between States, and order and law within their respective borders . . . ." 24 How., at 103. The samé "policy and necessity" underlie the measure adopted by Florida and forty-two other jurisdictions. Unless there is some provision in the United States Constitution which clearly prevents States from accomplishing this end by the means chosen, this Court must sustain the Uniform Act. The absence of a provision in the United States Constitution specifically granting power to the States to legislate respecting interstate rendition of witnesses presents no bar. To argue from the declaratory incor poration in the Constitution, Art. IV, § 2, of the ancient political policy among the Colonies of delivering up fugitives from justice an implied denial of the right to fashion other cooperative arrangements for the effective administration of justice, is to reduce the Constitution to a rigid, detailed and niggardly, code. In adjudging the validity of a statute effecting a new form of relationship between States, the search is not for a specific constitutional authorization for it. Rather, according the statute the full benefit of the presumption of constitutionality'which is the postulate of constitutional adjudication, wé must find clear incompatibility with the United States Constitution. The range of state power is not defined and delimited by an enumeration of legislative subject-matter. The Constitution did not purport to exhaust imagination and resourcefulness in devising fruitful interstate relationships. It is not tó be construed to limit the variety of arrangements which are possible through the voluntary and cooperative actions of individual States with a view to increasing harmony within the federalism created by the Constitution. Far from being divisive, this legislation is a catalyst of cohesion. It is within the unrestricted area of action left to the States by the .Constitution.
The Supreme Court of Florida found that the statute violated the Privileges and Immunities Clauses found in' Art. IV, § 2, and in the Fourteenth Amendment. The Privileges and Immunities Clause of Art.' IV, § 2; proscribes discrimination by a State against a citizen • of another State. Slaughter-House Cases, 16 Wall. 36, 77. There is no such discrimination here. The Florida statute applies to all persons within the boundaries, and therefore subject to the jurisdiction, of Florida. The finding of the Florida Supreme Court that the right to ingress.and egress is a privilege of national citizenship protected by the Fourteenth Ametidment raises an issue that has more than once been stirred in opinions of this Court. See concurring opinions in Edwards v. California, 314 U. S. 160, 178 and 184, in connection with Crandall v. Nevada, 6 Wall. 35. However, even if broad scope be given to such a privilege, there is no violation of that privilege by the Florida statute. Florida undoubtedly could have held respondent within Florida if he had been a material witness in a criminal proceeding within that State. And yet this would not have been less of a limitation on his claim of the right of ingress and egress than is an order to attend and testify in New York. There are restrictions on the exercise of the claimed constitutional right. One such restriction derives from the obligation to give testimony. This obligation has been sustained where it necessitated travel across the Atlantic Ocean. Blackmer v. United States, 284 U. S. 421.
•More fundamentally, this case does not involve freedom of travel in its essential sense. At most it represents a temporary interference with voluntary travel. Partic-' ularly is this so in an era of jet transportation when vast distances can be traversed in a matter of hours. Respondent was perfectly free to return to Florida after testifying in New York. Indeed, New York was obligated to pay his way back to Florida. Or, after testifying, he could return to Illinois or remain in New York. The privilege of ingress and egress among the States which has been urged in opinions is of hardier stuff. The privilege was to prevent the walling off of States, what has been called the Balkanization of the Nation. The requirement which respondent resists conduces, it merits repetition, toward a free-willed collaboration of independent States.
The more relevant challenge to the statute invalidated by the Supreme Court of Florida is that it denies due process' of law in violation of the Fourteenth Amendment. Because of the generous protections to be accorded a person brought or summoned before the court of the forwarding State, procedural due process in the hearing itself must be accorded and this, is firmly established. The Circuit Court of Dade County ruled that the absence of any provision for bail in the procedure of apprehension and delivery violated due process of lavy. Since the Supreme Court of Florida expressly refrained from ruling whether the failure of the statute to provide for bail for persons attached and delivered violated either the Florida Constitution or the Fourteenth Amendment, and since silence on bail is not tantamount to proscription of bail, the claim that this silence of the statute is a violation of the Fourteenth Amendment is a hypothetical question which need not now be considered. We may add that the sole claim before us, as it was the sole claim dealt with by the Supreme Court of Florida, is that, the statute i&> unconstitutional on its face. No claim is before us that the administration of the statute in the particular circumstances of this case violates due process.
The Supreme Court of Florida held that inasmuch as what was ordered was to be carried on in a foreign jurisdiction, the Florida courts could not constitutionally be given jurisdiction to order it (citing Pennoyer v. Neff, 95 U. S. 714). However, the Florida courts had immediate personal jurisdiction over respondent by virtue of his presence within that State. Insofar as the Fourteenth Amendment is concerned, this gave the Florida courts constitutional jurisdiction to order an act even though that act is to be performed outside of the State. See Steele v. Bulova Watch Co., 344 U. S. 280; Restatement, Conflict of Laws, § 94.
The primary purpose of -this Act is not eleemosynary. It serves a self-protective function for each of the enacting States. By enacting this law the Florida Legislature authorized and enabled Florida courts to employ the procedures of other jurisdictions for the obtaining of witnesses needed in criminal proceedings in Florida. Today forty-two States and Puerto Rico may facilitate criminal proceedings, otherwise impeded by the unavailability of material witnesses,-by utilizing the machinery of this reciprocal legislation to obtain such witnesses from with-, out their boundaries. This is not a merely altruistic, disinterested enactment.
In any event, to yield to an argument that benefiting other States is beyond the power of a State would completely disregard the inherent implications of bur federalism within whose framework our organic society lives and moves and has its being — the abundant and complicated interrelationship between national authority and the States, see Hopkins Federal Savings & Loan Assn. v. Cleary, 296 U. S. 315, and between the States inter sese. To yield to this argument would foreclose to the States virtually all arrangements which increase comity among the States. These extra-constitutional arrangements are designed to solve "problems created by a constitutional division of powers without disturbance of the federal nature of our government." Clark, Joint Activity Between Federal and State Officials, 51 Pol. Sci. Q. 230, 269. Reciprocal legislation,, such as the Uniform Law to Secure the Attendance of Witnesses from Within or Without a State in Criminal Proceedings and the Acts providing reciprocal periods of grace in the registration of out-of-state automobiles, see Kane v. New Jersey, 242 U. S. 160, is one such arrangement. The uniform laws proposed by the National Conference of Commissioners on Uniform State Laws and adopted by individual States have (among other benefits) increased ease of interstate commercial relationships by providing uniformity in commercial laws through uniform Acts governing sales and negotiable instruments. Uniform laws have frequently been concerned with enforcement of criminal laws. Thus, the Uniform Criminal Extradition Act, 9 U. L. A. 263 (1957), provides for rendition of alleged criminals whose conduct does not bring them within the constitutional extradition provision. U. S. Const., Art. IV, § 2; Hyatt v. People ex rel. Corkran, 188 U. S. 691. There are numerous cooperative undertakings among States by the formation of agencies which study joint problems and make suggestions for internal management within individual States calculated to increase comity among the several States. Interstate preserves are regulated through the device of fusion of distinct state administrative agencies by means of joint sessions and joint action. The Federal Government has also acted in aid of States in matters of local concern through auxiliary legislation (in game statutes, for example), through grarits-in-a'd, and through legislation calling for cooperation be ween particular state , administrative agencies and federal agencies operating within the same general area of regulation. See Frankfurter and Landis, The Compact Clause of the Constitution — A Study in Interstate Adjustments, 34 Yale L. J. 685, 688-691! About' such instances it has been said that they "illustrate extra-constitutional forms of legal invention for the solution of problems touching, more than one state. They were neither contemplated nor specifically provided for by the Constitution." Frankfurter .and Landis, supra, at 691.
The manifold arrangements by which the Federal' and State Governments collaborate constitute an extensive network of cooperative governmental activities not formulated in the Constitution but not offensive to any of its provisions or prohibitions. See Clark, supra. Among the examples of such devices discussed by Dr. Clark are the Selective Service System, Civilian Conservation Corps, deportation law enforcement, administration of the Pure Food and Drugs Act and the federal game statutes, and federal-state contracts for the boarding of federal prisoners in state facilities.
To hold that these and other arrangements are beyond the power of the States and Federal Goyernment because there is no specific empowering provision in the United States Constitution would be to take án unwarrantedly constricted view of state and national powers and would hobble the effective functioning of' our federalism. Diffusion of power has its corollary of diffusion of responsibilities, with its stimulus to cooperative effort in devising ways and means for making the federal system work. That is not a mechanical structure. It is an interplay of living forces of government to meet the evolving needs of a complex society.
The Constitution of the United States does not preclude resourcefulness of relationships between States on matters as to which there is no grant of power to Congress and as to whieh the range of .authority restricted within an individual State is inadequate. By reciprocal, voluntary legislation the States have invented methods to accomplish fruitful and unprohibited ends.' A citizen cannot shirk his duty, no matter how inconvenienced thereby, to testify in criminal proceedings and grand jury investigations in a State where he is found. There is no constitutional provision granting him relief from this obligation to testify , even though he must travel to another State to do so. Comity among States, an end particularly to be cherished when the object is enforcement of internal criminal laws, is not to be defeated by an a priori restrictive view of state power.
The judgment of the Supreme Court of Florida is reversed, and the cause is remanded to that court for proceedings not inconsistent with this opinion.
Reversed and remanded.
Compulsion to travel across State boundaries to testify in sister States antedates the United States Constitution. See Laws of Maryland, November 1785, Chapter I, An ACT to approve, confirm and ratify, the'compact made by the commissioners appointed by the general assembly of the Commonwealth of Virginia, and the commissioners appointed by this state, to regulate and settle the jurisdiction and navigation of Patowmack and Pocomoke rivers, and that part of Chesapeake bay which lieth withiri the territory of Virginia: "And in all cases of trial in pursuance of the jurisdiction settled by this compact, citizens of either state shall attend as. witnesses in the other, upon a summons from any court or magistrate having jurisdiction, being served by a proper officer of the county where such citizen shalLreside."