Mr. Chief Justice
Warren delivered the opinion of the Court.
The respondent Steve Nelson, an acknowledged member of the Communist Party, was convicted in the Court of Quarter Sessions of Allegheny County, Pennsylvania, of a violation of the Pennsylvania Sedition Act1 and sentenced to imprisonment for twenty years and to a fine of $10,000 and to costs of prosecution in the sum of $13,000. The Superior Court affirmed the conviction. 172 Pa. Super. 125, 92 A. 2d 431. The Supreme Court of Pennsylvania, recognizing but not reaching many alleged serious trial errors and conduct of the trial court infringing upon respondent’s right to due process of law,2 decided [499] the case on the narrow issue of supersession of the state law by the Federal Smith Act.3 In its opinion, the court stated:
“And, while the Pennsylvania statute proscribes sedition against either the Government of the United States or the Government of Pennsylvania, it is only alleged sedition against the United States with which the instant case is concerned. Out of all the voluminous testimony, we have not found, nor has anyone pointed to, a single word indicating a seditious act or even utterance directed against the Government of Pennsylvania.” 4
The precise holding of the court, and all that is before us for review, is that the Smith Act of 1940,5 as amended in 1948,6 which prohibits the knowing advocacy of the overthrow of the Government of the United States by force and violence, supersedes the enforceability of the Pennsylvania Sedition Act which proscribes the same conduct.
Many State Attorneys General and the Solicitor General of the United States appeared as amici curiae for petitioner, and several briefs were filed on behalf of the respondent. Because of the important question of federal-state relationship involved, we granted certiorari. 348 U. S. 814.
[500] It should be said at the outset that the decision in this case does not affect the right of States to enforce their sedition laws at times when the Federal Government has not occupied the field and is not protecting the entire country from seditious conduct. The distinction between the two situations was clearly recognized by the court below.7 Nor does it limit the jurisdiction of the States where the Constitution and Congress have specifically given them concurrent jurisdiction, as was done under the Eighteenth Amendment and the Volstead Act. United States v. Lanza, 260 XL S. 377. Neither does it limit the right of the State to protect itself at any time against sabotage or attempted violence of all kinds.8 Nor does it prevent the State from prosecuting where the same act constitutes both a federal offense and a state offense under the police power, as was done in Fox v. Ohio, 5 How. 410, and Gilbert v. Minnesota, 254 U. S. 325, relied upon by petitioner as authority herein. In neither of those cases did the state statute impinge on [501] federal jurisdiction. In the Fox case, the federal offense was counterfeiting. The state offense was defrauding the person to whom the spurious money was passed. In the Gilbert case this Court, in upholding the enforcement of a state statute, proscribing conduct which would “interfere with or discourage the enlistment of men in the military or naval forces of the United States or of the State of Minnesota,” treated it not as an act relating to “the raising of armies for the national defense, nor to rules and regulations for the government of those under arms [a constitutionally exclusive federal power]. It [was] simply a local police measure . ...” 9
Where, as in the instant case, Congress has not stated specifically whether a federal statute has occupied a field in which the States are otherwise free to legislate,10 dif[502] ferent criteria have furnished touchstones for decision. Thus,
“ [t] his Court, in considering the validity of state laws in the light of . . . federal laws touching the same subject, has made use of the following expressions: conflicting; contrary to; occupying the field; repugnance; difference; irreconcilability; inconsistency; violation; curtailment; and interference. But none of these expressions provides an infallible constitutional test or an exclusive constitutional yardstick. In the final analysis, there can be no one crystal clear distinctly marked formula.” Hines v. Davidowitz, 312 U. S. 52, 67.
And see Rice v. Santa Fe Elevator Corp., 331 U. S. 218, 230-231. In this case, we think that each of several tests of supersession is met.
First, “[t]he scheme of federal regulation [is] so pervasive as to make reasonable the inference that Congress left no room for the States to supplement it.” Rice v. Santa Fe Elevator Corp., 331 U. S., at 230. The Congress determined in 1940 that it was necessary for it to re-enter the field of antisubversive legislation, which had been abandoned by it in 1921. In that year, it enacted the Smith Act which proscribes advocacy of the overthrow of any government — federal, state or local — by force and violence and organization of and knowing membership in a group which so advocates.11 Conspiracy to commit any of these acts is punishable under the general criminal conspiracy provisions in 18 U. S. C. § 371. The Internal Security Act of 1950 is aimed more directly at Communist organizations.12 It distinguishes between “Communist-[503] action organizations” and "Communist-front organizations,” 13 requiring such organizations to register and to file annual reports with the Attorney General giving complete details as to their officers and funds.14 Members of Communist-action organizations who have not been registered by their organization must register as individuals.15 Failure to register in accordance with the requirements of Sections 786-787 is punishable by a fine of not more than $10,000 for an offending organization and by a fine of not more than $10,000 or imprisonment for not more than five years or both for an individual offender — each day of failure to register constituting a separate offense.16 And the Act imposes certain sanctions upon both “action” and “front” organizations and their members.17 The Communist Control Act of 1954 declares “that the Communist Party of the United States, although purportedly a political party, is in fact an instrumentality of a conspiracy to overthrow the Government of the United States” and that “its role as the agency of a hostile foreign power renders its existence a clear present and continuing danger to the security of the United States.” 18 It also contains a legislative finding that the Communist Party is a “Communist-action organization” within the meaning of the Internal Security Act of 1950 and provides that “knowing” members of the Communist Party are “subject to all the provisions and penalties” of that Act.19 It furthermore sets up a new classification of “Communist-infiltrated organ[504] izations” 20 and provides for the imposition of sanctions against them.
We examine these Acts only to determine the congressional plan. Looking to all of them in the aggregate, the conclusion is inescapable that Congress has intended to occupy the field of sedition. Taken as a whole, they evince a congressional plan which makes it reasonable to determine that no room has been left for the States to supplement it. Therefore, a state sedition statute is superseded regardless of whether it purports to supplement the federal law. As was said by Mr. Justice Holmes in Charleston & Western Carolina R. Co. v. Varnville Furniture Co., 237 U. S. 597, 604:
“When Congress has taken the particular subject-matter in hand coincidence is as ineffective as opposition, and a state law is not to be declared a help because it attempts to go farther than Congress has seen fit to go.”
Second, the federal statutes “touch a field in which the federal interest is so dominant that the federal system [must] be assumed to preclude enforcement of state laws on the same subject.” Rice v. Santa Fe Elevator Corp., 331 U. S., at 230, citing Hines v. Davidowitz, supra,21 Congress has devised an all-embracing program for resistance to the various forms of totalitarian aggression. Our external defenses have been strengthened, and a plan to [505] protect against internal subversion has been made by it. It has appropriated vast sums, not only for our own protection, but also to strengthen freedom throughout the world. It has charged the Federal Bureau of Investigation and the Central Intelligence Agency with responsibility for intelligence concerning Communist seditious activities against our Government, and has denominated such activities as part of a world conspiracy. It accordingly proscribed sedition against all government in the nation — national, state and local. Congress declared that these steps were taken “to provide for the common defense, to preserve the sovereignty of the United States as an independent nation, and to guarantee to each State a republican form of government . . . .”22 Congress having thus treated seditious conduct as a matter of vital national concern, it is in no sense a local enforcement problem. As was said in the court below:
“Sedition against the United States is not a local offense. It is a crime against the Nation. As such, it should be prosecuted and punished in the Federal courts where this defendant has in fact been prosecuted and convicted and is now under sentence.23 It is not only important but vital that such prosecutions should be exclusively within the control of the Federal Government . . . 24
Third, enforcement of state sedition acts presents a serious danger of conflict with the administration of the federal program. Since 1939, in order to avoid a hampering of uniform enforcement of its program by sporadic local prosecutions, the Federal Government has urged [506] local authorities not to intervene in such matters, but to turn over to the federal authorities immediately and unevaluated all information concerning subversive activities. The President made such a request on September 6, 1939, when he placed the Federal Bureau of Investigation in charge of investigation in this field:
“The Attorney General has been requested by me to instruct the Federal Bureau of Investigation of the Department of Justice to take charge of investigative work in matters relating to espionage, sabotage, and violations of the neutrality regulations.
“This task must be conducted in a comprehensive and effective manner on a national basis, and all information must be carefully sifted out and correlated in order to avoid confusion and irresponsibility.
“To this end I request all police officers, sheriffs, and all other law enforcement officers in the United States promptly to turn over to the nearest representative of the Federal Bureau of Investigation any information obtained by them relating to espionage, counterespionage, sabotage, subversive activities and violations of the neutrality laws.” 25
And in addressing the Federal-State Conference on Law Enforcement Problems of National Defense, held on August 5 and 6, 1940, only a few weeks after the passage of the Smith Act, the Director of the Federal Bureau of Investigation said:
“The fact must not be overlooked that meeting the spy, the saboteur and the subverter is a problem that must be handled on a nation-wide basis. An isolated incident in the middle west may be of little significance, but when fitted into a national pattern [507] of similar incidents, it may lead to an important revelation of subversive activity. It is for this reason that the President requested all of our citizens and law enforcing agencies to report directly to the Federal Bureau of Investigation any complaints or information dealing with espionage, sabotage or subversive activities. In such matters, time is of the essence. It is unfortunate that in a few States efforts have been made by individuals not fully acquainted with the far-flung ramifications of this problem to interject superstructures of agencies between local law enforcement and the FBI to sift what might be vital information, thus delaying its immediate reference to the FBI. This cannot be, if our internal security is to be best served. This is no time for red tape or amateur handling of such vital matters. There must be a direct and free flow of contact between the local law enforcement agencies and the FBI. The job of meeting the spy or saboteur is one for experienced men of law enforcement.” 26
Moreover, the Pennsylvania Statute presents a peculiar danger of interference with the federal program. For, as the court below observed:
“Unlike the Smith Act, which can be administered only by federal officers acting in their official capacities, indictment for sedition under the Pennsylvania statute can be initiated upon an information made by a private individual. The opportunity thus present for the indulgence of personal spite and hatred or for furthering some selfish advantage or ambition need only be mentioned to be appreciated. Defense of the Nation by law, no less than by arms, should be a public and not a private undertaking. It is [508] important that punitive sanctions for sedition against the United States be such as have been promulgated by the central governmental authority and administered under the supervision and review of that authority’s judiciary. If that be done, sedition will be detected and punished, no less, wherever it may be found, and the right of the individual to speak freely and without fear, even in criticism of the government, will at the same time be protected.” 27
In his brief, the Solicitor General states that forty-two States plus Alaska and Hawaii have statutes which in some form prohibit advocacy of the violent overthrow of established government. These statutes are entitled anti-sedition statutes, criminal anarchy laws, criminal syndicalist laws, etc. Although all of them are primarily directed against the overthrow of the United States Government, they are in no sense uniform. And our attention has not been called to any case where the prosecution has been successfully directed against an attempt to destroy state or local government. Some of these Acts are studiously drawn and purport to protect fundamental rights by appropriate definitions, standards of proof and orderly procedures in keeping with the avowed congressional purpose “to protect freedom from those who would destroy it, without infringing upon the freedom of all our people.” Others are vague and are almost wholly without such safeguards. Some even purport to punish mere membership in subversive organizations which the federal statutes do not punish where federal registration requirements have been fulfilled.28
[509] When we were confronted with a like situation in the field of labor-management relations, Mr. Justice Jackson wrote:
"A multiplicity of tribunals and a diversity of procedures are quite as apt to produce incompatible or conflicting adjudications as are different rules of substantive law.” 29
Should the States be permitted to exercise a concurrent jurisdiction in this area, federal enforcement would encounter not only the difficulties mentioned by Mr. Justice Jackson, but the added conflict engendered by different criteria of substantive offenses.
Since we find that Congress has occupied the field to the exclusion of parallel state legislation, that the dominant interest of the Federal Government precludes state intervention, and that administration of state Acts would conflict with the operation of the federal plan, we are convinced that the decision of the Supreme Court of Pennsylvania is unassailable.
We are not unmindful of the risk of compounding punishments which would be created by finding concurrent state power. In our view of the case, we do not reach the question whether double or multiple punishment for the same overt acts directed against the United States has constitutional sanction.30 Without compelling [510] indication to the contrary, we will not assume that Congress intended to permit the possibility of double punishment. Cf. Houston v. Moore, 5 Wheat. 1, 31, 75; Jerome v. United States, 318 U. S. 101, 105.
The judgment of the Supreme Court of Pennsylvania is
Affirmed.
[For dissenting opinion of Mr. Justice Reed, joined by Mr. Justice Burton and Mr. Justice Minton, see post, p. 512.]
APPENDIX.
Pennsylvania Penal Code § 207.
The word “sedition,” as used in this section, shall mean:
Any writing, publication, printing, cut, cartoon, utterance, or conduct, either individually or in connection or combination with any other person, the intent of which is:
(a) To make or cause to be made any outbreak or demonstration of violence against this State or against the United States.
(b) To encourage any person to take any measures or engage in any conduct with a view of overthrowing or destroying or attempting to overthrow or destroy, by any force or show or threat of force, the Government of this State or of the United States.
(c) To incite or encourage any person to commit any overt act with a view to bringing the Government of this State or of the United States into hatred or contempt.
(d) To incite any person or persons to do or attempt to do personal injury or harm to any officer of this State or of the United States, or to damage or destroy any public property or the property of any public official because of his official position.
[511] The word “sedition” shall also include:
(e) The actual damage to, or destruction of, any public property or the property of any public official, perpetrated because the owner or occupant is in official position.
(f) Any writing, publication, printing, cut, cartoon, or utterance which advocates or teaches the duty, necessity, or propriety of engaging in crime, violence, or any form of terrorism, as a means of accomplishing political reform or change in government.
(g) The sale, gift or distribution of any prints, publications, books, papers, documents, or written matter in any form, which advocates, furthers or teaches sedition as hereinbefore defined.
(h) Organizing or helping to organize or becoming a member of any assembly, society, or group, where any of the policies or purposes thereof are seditious as hereinbefore defined.
Sedition shall be a felony. Whoever is guilty of sedition shall, upon conviction thereof, be sentenced to pay a fine not exceeding ten thousand dollars ($10,000), or to undergo imprisonment not exceeding twenty (20) years, or both.
18 U. S. C. § 2385.
Whoever knowingly or willfully advocates, abets, advises, or teaches the duty, necessity, desirability, or propriety of overthrowing or destroying the government of the United States or the government of any State, Territory, District or Possession thereof, or the government of any political subdivision therein, by force or violence, or by the assassination of any officer of any such government; or
Whoever, with intent to cause the overthrow or destruction of any such government, prints, publishes, edits, issues, circulates, sells, distributes, or publicly displays any written or printed matter advocating, advising, or teaching the duty, necessity, desirability, or propriety of [512] overthrowing or destroying any government in the United States by force or violence, or attempts to do so; or
Whoever organizes or helps or attempts to organize any society, group, or assembly of persons who teach, advocate, or encourage the overthrow or destruction of any such government by force or violence; or becomes or is a member of, or affiliates with, any such society, group, or assembly of persons, knowing the purposes thereof—
Shall be fined not more than $10,000 or imprisoned not more than ten years, or both, and shall be ineligible for employment by the United States or any department or agency thereof, for the five years next following his conviction.
Although the judgments of conviction in both Gitlow and Whitney were rendered in 1920, before repeal of the federal wartime sedition statute of 1918, 41 Stat. 1359, the question of supersession was not raised in either case and, of course, not considered in this Court’s opinions.