[385] Mr. Chief Justice Vinson
delivered the opinion of the Court.
In these cases, the constitutionality of labor legislation of the State of Wisconsin known as the Public Utility Anti-Strike Law,1 has been drawn in question.
Petitioners in No. 329 are the union and its officers who represent the employees of the Milwaukee Electric Railway and Transport Company of Milwaukee, Wisconsin, for collective-bargaining purposes.2 For many years, the transit workers entered into collective-bargaining agreements with the transit company without resorting to strike. In 1948, however, the collective agreement was terminated when the parties were unable to agree on wages, hours and working conditions and the transit workers’ union called a strike to enforce union demands. The respondent Wisconsin Employment Relations Board secured immediately an ex parte order from a State Circuit Court restraining the strike and, in compliance with that order, the union postponed its strike. Thereafter, the same Circuit Court entered a judgment under which petitioners are “perpetually restrained and enjoined from calling a strike . . . which would cause an interruption of the passenger service of the [transit company].” The Wisconsin Supreme Court affirmed the judgment, 257 Wis. 43, 42 N. W. 2d 471 (1950), and we granted certiorari, 340 U. S. 874 (1950), to review the important questions decided below.
[386] Petitioners in No. 438 are the union and its officers who represent employees of the Milwaukee Gas Light Company and its subsidiary, the Milwaukee Solvay Coke Company, both of Milwaukee, Wisconsin, pursuant to a certification of the National Labor Relations Board.3 In 1949, the collective agreement between petitioners and the gas company was terminated and, upon failure of further bargaining and conciliation to resolve the dispute, a strike was called and the gas workers left their jobs. Respondent Wisconsin Employment Relations Board obtained forthwith an ex parte restraining order from a State Circuit Court requiring that petitioners “absolutely desist and refrain from calling a strike [or] going out on strike . . . which would cause an interruption of the service of the [gas company]” and ordering petitioners to “take immediate steps to notify all employes called out on strike to resume service forthwith.” Although the strike was settled soon thereafter, the Circuit Court found that petitioners had not obeyed the restraining order and entered a judgment of contempt, imposing fines of $250 upon each petitioner. The Wisconsin Supreme Court affirmed that judgment, 258 Wis. 1, 44 N. W. 2d 547 (1950), and we granted certiorari, 340 U. S. 903 (1950), since this case raises the same substantial questions as those before the Court in No. 329.
The injunctions were issued in each case upon the complaint of the Wisconsin Employment Relations Board, charged by statute with the enforcement of the Public Utility Anti-Strike Law. That act vests in the state [387] circuit courts jurisdiction to enjoin violations of the act, Wis. Stat., 1949, § 111.63, the substantive provision involved in these cases providing as follows:
“It shall be unlawful for any group of employes of a public utility employer acting in concert to call a strike or to go out on strike, or to cause any work stoppage or slowdown which would cause an interruption of an essential service; it also shall be unlawful for any public utility employer to lock out his employes when such action would cause an interruption of essential service; and it shall be unlawful for any person or persons to instigate, to induce, to conspire with, or to encourage any other person or persons to engage in any strike or lockout or slowdown or work stoppage which would cause an interruption of an essential service. Any violation of this section by any member of a group of employes acting in concert or by any employer or by any officer of an employer acting for such employer, or by any other individual, shall constitute a misdemeanor.” Wis. Stat., 1949, § 111.62.4
[388] This provision is part of a statutory pattern designed to become effective whenever collective bargaining results in an “impasse and stalemate” likely to cause interruption of the supply of an “essential public utility service,” Wis. Stat., 1949, § 111.50, that service including water, heat, gas, electric power, public passenger transportation and communications. Id., § 111.51. Whenever such an “impasse” occurs, the Wisconsin Employment Relations Board is empowered to appoint a conciliator to meet with the parties in an effort to settle the dispute. Id., § 111.54. In the event of a failure of conciliation, the Board is directed to select arbitrators who shall “hear and determine” the dispute. Id., § 111.55. The act establishes standards to govern the decision of the arbitrators, id., §§ 111.57-111.58, and provides that the order of the arbitrators shall be final and binding upon the parties, id., § 111.59, subject to judicial review, id., § 111.60. In summary, the act substitutes arbitration upon order of the Board for collective bargaining whenever an impasse is reached in the bargaining process. And, to insure conformity with the statutory scheme, Wisconsin denies to utility employees the right to strike.
In upholding the constitutionality of the Public Utility Anti-Strike Act, the Wisconsin Supreme Court stressed the importance of utility service to the public welfare and the plenary power which a state is accustomed to exercise over such enterprises. Petitioners’ claim that the Wisconsin law conflicts with federal legislation enacted under the Commerce Clause of the Constitution (Art. I, § 8) was overruled, as were petitioners’ contentions that the Wisconsin Act violates the Due Process Clause of the Fourteenth Amendment and the Thirteenth Amendment. Respondents controvert each of these contentions and, apart from the questions of res judicata discussed in No. 302, decided this day, post, p. 411, raise no other grounds in support of the judgments below. We deal only with [389] the question of conflicting federal legislation as we have found that issue dispositive of both cases.
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[385] Mr. Chief Justice Vinson
delivered the opinion of the Court.
In these cases, the constitutionality of labor legislation of the State of Wisconsin known as the Public Utility Anti-Strike Law,1 has been drawn in question.
Petitioners in No. 329 are the union and its officers who represent the employees of the Milwaukee Electric Railway and Transport Company of Milwaukee, Wisconsin, for collective-bargaining purposes.2 For many years, the transit workers entered into collective-bargaining agreements with the transit company without resorting to strike. In 1948, however, the collective agreement was terminated when the parties were unable to agree on wages, hours and working conditions and the transit workers’ union called a strike to enforce union demands. The respondent Wisconsin Employment Relations Board secured immediately an ex parte order from a State Circuit Court restraining the strike and, in compliance with that order, the union postponed its strike. Thereafter, the same Circuit Court entered a judgment under which petitioners are “perpetually restrained and enjoined from calling a strike . . . which would cause an interruption of the passenger service of the [transit company].” The Wisconsin Supreme Court affirmed the judgment, 257 Wis. 43, 42 N. W. 2d 471 (1950), and we granted certiorari, 340 U. S. 874 (1950), to review the important questions decided below.
[386] Petitioners in No. 438 are the union and its officers who represent employees of the Milwaukee Gas Light Company and its subsidiary, the Milwaukee Solvay Coke Company, both of Milwaukee, Wisconsin, pursuant to a certification of the National Labor Relations Board.3 In 1949, the collective agreement between petitioners and the gas company was terminated and, upon failure of further bargaining and conciliation to resolve the dispute, a strike was called and the gas workers left their jobs. Respondent Wisconsin Employment Relations Board obtained forthwith an ex parte restraining order from a State Circuit Court requiring that petitioners “absolutely desist and refrain from calling a strike [or] going out on strike . . . which would cause an interruption of the service of the [gas company]” and ordering petitioners to “take immediate steps to notify all employes called out on strike to resume service forthwith.” Although the strike was settled soon thereafter, the Circuit Court found that petitioners had not obeyed the restraining order and entered a judgment of contempt, imposing fines of $250 upon each petitioner. The Wisconsin Supreme Court affirmed that judgment, 258 Wis. 1, 44 N. W. 2d 547 (1950), and we granted certiorari, 340 U. S. 903 (1950), since this case raises the same substantial questions as those before the Court in No. 329.
The injunctions were issued in each case upon the complaint of the Wisconsin Employment Relations Board, charged by statute with the enforcement of the Public Utility Anti-Strike Law. That act vests in the state [387] circuit courts jurisdiction to enjoin violations of the act, Wis. Stat., 1949, § 111.63, the substantive provision involved in these cases providing as follows:
“It shall be unlawful for any group of employes of a public utility employer acting in concert to call a strike or to go out on strike, or to cause any work stoppage or slowdown which would cause an interruption of an essential service; it also shall be unlawful for any public utility employer to lock out his employes when such action would cause an interruption of essential service; and it shall be unlawful for any person or persons to instigate, to induce, to conspire with, or to encourage any other person or persons to engage in any strike or lockout or slowdown or work stoppage which would cause an interruption of an essential service. Any violation of this section by any member of a group of employes acting in concert or by any employer or by any officer of an employer acting for such employer, or by any other individual, shall constitute a misdemeanor.” Wis. Stat., 1949, § 111.62.4
[388] This provision is part of a statutory pattern designed to become effective whenever collective bargaining results in an “impasse and stalemate” likely to cause interruption of the supply of an “essential public utility service,” Wis. Stat., 1949, § 111.50, that service including water, heat, gas, electric power, public passenger transportation and communications. Id., § 111.51. Whenever such an “impasse” occurs, the Wisconsin Employment Relations Board is empowered to appoint a conciliator to meet with the parties in an effort to settle the dispute. Id., § 111.54. In the event of a failure of conciliation, the Board is directed to select arbitrators who shall “hear and determine” the dispute. Id., § 111.55. The act establishes standards to govern the decision of the arbitrators, id., §§ 111.57-111.58, and provides that the order of the arbitrators shall be final and binding upon the parties, id., § 111.59, subject to judicial review, id., § 111.60. In summary, the act substitutes arbitration upon order of the Board for collective bargaining whenever an impasse is reached in the bargaining process. And, to insure conformity with the statutory scheme, Wisconsin denies to utility employees the right to strike.
In upholding the constitutionality of the Public Utility Anti-Strike Act, the Wisconsin Supreme Court stressed the importance of utility service to the public welfare and the plenary power which a state is accustomed to exercise over such enterprises. Petitioners’ claim that the Wisconsin law conflicts with federal legislation enacted under the Commerce Clause of the Constitution (Art. I, § 8) was overruled, as were petitioners’ contentions that the Wisconsin Act violates the Due Process Clause of the Fourteenth Amendment and the Thirteenth Amendment. Respondents controvert each of these contentions and, apart from the questions of res judicata discussed in No. 302, decided this day, post, p. 411, raise no other grounds in support of the judgments below. We deal only with [389] the question of conflicting federal legislation as we have found that issue dispositive of both cases.
First. We have recently examined the extent to which Congress has regulated peaceful strikes for higher wages in industries affecting commerce. Automobile Workers v. O’Brien, 339 U. S. 454 (1950). We noted that Congress, in § 7 of the National Labor Relations Act of 1935,5 as amended by the Labor Management Relations Act of 1947,6 expressly safeguarded for employees in such industries the “right ... to engage in . . . concerted activities for the purpose of collective bargaining or other mutual aid or protection,” 7 “e. g., to strike.”8 We also listed the qualifications and regulations which Congress .itself has imposed upon its guarantee of the right to strike, [390] including requirements that notice be given prior to any strike upon termination of a contract,9 prohibitions on strikes for certain objectives declared unlawful by Congress,10 and special procedures for certain strikes which might create national emergencies.11 Upon review of these federal legislative provisions, we held, 339 U. S. at 457:
“None of these sections can be read as permitting concurrent state regulation of peaceful strikes for higher wages. Congress occupied this field and closed it to state regulation. Plankinton Packing Co. v. Wisconsin Board, 338 U. S. 953 (1950); La Crosse Telephone Corp. v. Wisconsin Board, 336 U. S. 18 (1949); Bethlehem Steel Co. v. New York Labor Board, 330 U. S. 767 (1947); Hill v. Florida, 325 U. S. 538 (1945).”12
[391] Second. The Wisconsin court sought to distinguish Automobile Workers v. O’Brien, supra, on the ground that the industry to which Michigan applied its notice and strike-vote provisions was a national manufacturing organization rather than a local public utility. Congress drew no such distinction but, instead, saw fit to regulate labor relations to the full extent of its constitutional power under the Commerce Clause, Labor Board v. Fainblatt, 306 U. S. 601, 607 (1939). Ever since the question was fully argued and decided in Consolidated Edison Co. v. Labor Board, 305 U. S. 197 (1938), it has been clear that federal labor legislation, encompassing as it does all industries “affecting commerce,” applies to a privately owned public utility whose business and activities are carried on wholly within a single state. The courts of appeal have uniformly held enterprises similar to and no more important to interstate commerce than the Milwaukee gas and transit companies before us in these cases subject to the provisions of the federal labor law.13 No [392] distinction between public utilities and national manufacturing organizations has been drawn in the administration of the Federal Act14 and, when separate treatment for public utilities was urged upon Congress in 1947, the suggested differentiation was expressly rejected.15 Cre[393] ation of a special classification for public utilities is for Congress, not for this Court.
Third. As we have noted, in 1947 Congress enacted special procedures to deal with strikes which might create national emergencies.16 Respondents rely upon that action as showing a congressional intent to carve out a separate field of “emergency” labor disputes and, pointing to the fact that Congress acted only in respect to “national emergencies,” respondents ask us to hold that Congress intended, by silence, to leave the states free to regulate “local emergency” disputes. However, the Wisconsin Act before us is not “emergency” legislation but a comprehensive code for the settlement of labor disputes between public-utility employers and employees.17 Far from being limited to “local emergencies,” the [394] act has been applied to disputes national in scope,18 and application of the act does not require the existence of an “emergency.”19 In any event, congressional imposition of certain restrictions on petitioners’ right to strike, far from supporting the Wisconsin Act, shows that Congress has closed to state regulation the field of peaceful strikes in industries affecting commerce. Automobile Workers v. O’Brien, supra, at 457. And where, as here, the state seeks to deny entirely a federally guaranteed right which Congress itself restricted only to a limited extent in case of national emergencies, however serious, it is manifest that the state legislation is in conflict with federal law.
Like the majority strike-vote provision considered in O’Brien, a proposal that the right to strike be denied, together with the substitution of compulsory arbitration in cases of “public emergencies,” local or national, was before Congress in 1947.20 This proposal, closely resembling the pattern of the Wisconsin Act, was rejected by Congress as being inconsistent with its policy in respect [395] to enterprises covered by the Federal Act, and not because of any desire to leave the states free to adopt it.21 Michigan, in O’Brien, sought to impose conditions on the right to strike and now Wisconsin seeks to abrogate that right [396] altogether insofar as petitioners are concerned.22 Such state legislation must yield as conflicting with the exercise of federally protected labor rights.
[397] Fourth. Much of the argument generated by these cases has been considerably broader than the legal questions presented.
The utility companies, the State of Wisconsin and other states as amici stress the importance of gas and transit service to the local community and urge that predominantly local problems are best left to local governmental authority for solution. On the other hand, petitioners and the National Labor Relations Board, as amicus, argue that prohibition of strikes with reliance upon compulsory arbitration for ultimate solution of labor disputes destroys the free collective bargaining declared by Congress to be the bulwark of the national labor policy. This, it is said, leads to more labor unrest and disruption of service than is now experienced under a system of free collective bargaining accompanied by the right to strike. The very nature of the debatable policy questions raised by these contentions convinces us that they cannot properly be resolved by the Court. In our view, these questions are for legislative determination and have been resolved by Congress adversely to respondents.
When it amended the Federal Act in 1947, Congress was not only cognizant of the policy questions that have been argued before us in these cases, but it was also well aware of the problems in balancing state-federal relationships which its 1935 legislation had raised. The legislative history of the 1947 Act refers to the decision of this Court in Bethlehem Steel Co. v. New York Labor Board, 330 U. S. 767 (1947), and, in its handling of the problems presented by that case, Congress demonstrated that it knew how to cede jurisdiction to the states.23 Congress [398] knew full well that its labor legislation “preempts the field that the act covers insofar as commerce within the meaning of the act is concerned” 24 and demonstrated its ability to spéll out with particularity those areas in which it desired state regulation to be operative.25 This Court, in the exercise of its judicial function, must take the comprehensive and valid federal legislation as enacted and declare invalid state regulation which impinges on that legislation.
Fifth. It would be sufficient to state that the Wisconsin Act, in forbidding peaceful strikes for higher wages in industries covered by the Federal Act, has forbidden the exercise of rights protected by § 7 of the Federal Act. In addition, it is not difficult to visualize situations in which application of the Wisconsin Act would work at cross-purposes with other policies of the National Act. But we content ourselves with citation of examples of direct conflict found in the records before us. In the case of the transit workers, the union agreed to continue collective bargaining after the strike became imminent, whereas the company insisted upon invocation of the compulsory arbitration features of the Wisconsin Act. That act requires that collective bargaining continue until an “impasse” is reached, Wis. Stat., 1949; § 111.52, whereas the Federal [399] Act requires that both employer and employees continue •to bargain collectively,26 even though a strike may actually be in progress. Labor Board v. Mackay Radio & Telegraph Co., 304 U. S. 333, 345 (1938). Further, the transit company was able to avoid entirely any determination of certain union demands when the arbitrators, in accordance with Wis. Stat., 1949, § 111.58, ruled that the matter of assigning of workers to certain shifts “infringe [s] upon the right of the employer to manage his business.” Yet similar problems of work scheduling and shift assignment have been held to be appropriate subjects for collective bargaining under the Federal Act as administered by the National Labor Relations Board. See Woodside Cotton Mills Co., 21 N. L. R. B. 42, 54-55 (1940); American National Ins. Co., 89 N. L. R. B. 185 (1950), and eases cited therein.
The National Labor Relations Act of 1935 and the Labor Management Relations Act of 1947, passed by Congress pursuant to its powers under the Commerce Clause, are the supreme law of the land under Art. VI of the Constitution. Having found that the Wisconsin Public Utility Anti-Strike Law conflicts with that federal legislation, the judgments enforcing the Wisconsin Act cannot stand.
Reversed.