[618]*618Mr. Justice Frankfurter
delivered the opinion of the Court.
Claiming to have been expelled from membership in the International Association of Machinists and its Local No. 68 in violation of his rights under the constitution and by-laws of the unions, respondent, a marine machinist, brought this suit against the International and Local, together with their officers, in a Superior Court in California for restoration of his membership in the unions and for damages due to his illegal expulsion. The case was tried to the court, and, on the basis of the pleadings, evidence, and argument of counsel, detailed findings of fact were made, conclusions of law drawn, and a judgment entered ordering the reinstatement of respondent and awarding him damages for lost wages as well as for physical and mental suffering. The judgment was affirmed by the District Court of Appeal, 142 Cal. App. 2d 207, 298 P. 2d 92, and the Supreme Court of California denied a petition for hearing. We brought the case here, 352 U. S. 966, since it presented another important question concerning the extent to which the National Labor Relations Act, 49 Stat. 449, as amended, 29 U. S. C. §§ 141-188, has excluded the exercise of state power.
The crux of the claim sustained by the California court was that under California law membership in a labor union constitutes a contract between the member and the union, the terms of which are governed by the constitution and by-laws of the union, and that state law provides, through mandatory reinstatement and damages, a remedy for breach of such contract through wrongful expulsion. This contractual conception of the relation between a member and his union widely prevails in this country and has recently been adopted by the House of Lords in Bonsor v. Musicians’ Union, [1956] A. C. 104. It has been the law of Cali[619]*619fornia for at least half a century. See Dingwall v. Amalgamated Assn. of Street R. Employees, 4 Cal. App. 565, 88 P. 597. Though an unincorporated association, a labor union is for many purposes given the rights and subjected to the obligations of a legal entity. See United Mine Workers v. Coronado Coal Co., 259 U. S. 344, 383-392; United States v. White, 322 U. S. 694, 701-703.
That the power of California to afford the remedy of reinstatement for the wrongful expulsion of a union member has not been displaced by the Taft-Hartley Act is admitted by petitioners. Quite properly they do not attack so much of the judgment as orders respondent’s reinstatement. As Garner v. Teamsters Union, 346 U. S. 485, could not avoid deciding, the Taft-Hartley Act undoubtedly carries implications of exclusive federal authority. Congress withdrew from the States much that had theretofore rested with them. But the other half of what was pronounced in Garner — that the Act “leaves much to the states” — is no less important. See 346 U. S., at 488. The statutory implications concerning what has been taken from the States and what has been left to them are of a Delphic nature, to be translated into concreteness by the process of litigating elucidation. See Weber v. Anheuser-Busch, Inc., 348 U. S. 468, 474-477.
Since we deal with implications to be drawn from the Taft-Hartley Act for the avoidance of conflicts between enforcement of federal policy by the National Labor Relations Board and the exertion of state power, it might be abstractly justifiable, as a matter of wooden logic, to suggest that an action in a state court by a member of a union for restoration of his membership rights is precluded. In such a suit there may be embedded circumstances that could constitute an unfair labor practice under § 8 (b) (2) of the Act. In the judgment of the [620]*620Board, expulsion from a union, taken in connection with other circumstances established in a particular case, might constitute an attempt to cause an employer to “discriminate against an employee with respect to whom membership in such organization has been denied or terminated on some ground other than his failure to tender the periodic dues and the initiation fees uniformly required as a condition of acquiring or retaining membership . . . 61 Stat. 141, 29 U. S. C. §158 (b)(2). But the protection of union members in their rights as members from arbitrary conduct by unions and union officers has not been undertaken by federal law, and indeed the assertion of any such power has been expressly denied. The proviso to § 8 (b)(1) of the Act states that “this paragraph shall not impair the right of a labor organization to prescribe its own rules with respect to the acquisition or retention of membership therein . . . .” 61 Stat. 141, 29 U. S. C. § 158 (b) (1). The present controversy is precisely one that gives legal efficacy under state law to the rules prescribed by a labor organization for “retention of membership therein.” Thus, to preclude a state court from exerting its traditional jurisdiction to determine and enforce the rights of union membership would in many cases leave an unjustly ousted member without remedy for the restoration of his important union rights. Such a drastic result, on the remote possibility of some entanglement with the Board’s enforcement of the national policy, would require a more compelling indication of congressional will than can be found in the interstices of the Taft-Hartley Act. See United Constr. Workers v. Laburnum Constr. Corp., 347 U. S. 656.
Although petitioners do not claim that the state court lacked jurisdiction to order respondent’s reinstatement, they do contend that it was without power to fill out this [621]*621remedy by an award of damages for loss of wages and suffering resulting from the breach of contract. No radiation of the Taft-Hartley Act requires us thus to mutilate the comprehensive relief of equity and reach such an incongruous adjustment of federal-state relations touching the regulation of labor. The National Labor Relations Board could not have given respondent the relief that California gave him according to its local law of contracts and damages. Although, if the unions’ conduct constituted an unfair labor practice, the Board might possibly have been empowered to award back pay, in no event could it mulct in damages for mental or physical suffering. And the possibility of partial relief from the Board does not, in such a case as is here presented, deprive a party of available state remedies for all damages suffered. See International Union, United Automobile Workers v. Russell, post, p. 634.
If, as we held in the Laburnum
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[618]*618Mr. Justice Frankfurter
delivered the opinion of the Court.
Claiming to have been expelled from membership in the International Association of Machinists and its Local No. 68 in violation of his rights under the constitution and by-laws of the unions, respondent, a marine machinist, brought this suit against the International and Local, together with their officers, in a Superior Court in California for restoration of his membership in the unions and for damages due to his illegal expulsion. The case was tried to the court, and, on the basis of the pleadings, evidence, and argument of counsel, detailed findings of fact were made, conclusions of law drawn, and a judgment entered ordering the reinstatement of respondent and awarding him damages for lost wages as well as for physical and mental suffering. The judgment was affirmed by the District Court of Appeal, 142 Cal. App. 2d 207, 298 P. 2d 92, and the Supreme Court of California denied a petition for hearing. We brought the case here, 352 U. S. 966, since it presented another important question concerning the extent to which the National Labor Relations Act, 49 Stat. 449, as amended, 29 U. S. C. §§ 141-188, has excluded the exercise of state power.
The crux of the claim sustained by the California court was that under California law membership in a labor union constitutes a contract between the member and the union, the terms of which are governed by the constitution and by-laws of the union, and that state law provides, through mandatory reinstatement and damages, a remedy for breach of such contract through wrongful expulsion. This contractual conception of the relation between a member and his union widely prevails in this country and has recently been adopted by the House of Lords in Bonsor v. Musicians’ Union, [1956] A. C. 104. It has been the law of Cali[619]*619fornia for at least half a century. See Dingwall v. Amalgamated Assn. of Street R. Employees, 4 Cal. App. 565, 88 P. 597. Though an unincorporated association, a labor union is for many purposes given the rights and subjected to the obligations of a legal entity. See United Mine Workers v. Coronado Coal Co., 259 U. S. 344, 383-392; United States v. White, 322 U. S. 694, 701-703.
That the power of California to afford the remedy of reinstatement for the wrongful expulsion of a union member has not been displaced by the Taft-Hartley Act is admitted by petitioners. Quite properly they do not attack so much of the judgment as orders respondent’s reinstatement. As Garner v. Teamsters Union, 346 U. S. 485, could not avoid deciding, the Taft-Hartley Act undoubtedly carries implications of exclusive federal authority. Congress withdrew from the States much that had theretofore rested with them. But the other half of what was pronounced in Garner — that the Act “leaves much to the states” — is no less important. See 346 U. S., at 488. The statutory implications concerning what has been taken from the States and what has been left to them are of a Delphic nature, to be translated into concreteness by the process of litigating elucidation. See Weber v. Anheuser-Busch, Inc., 348 U. S. 468, 474-477.
Since we deal with implications to be drawn from the Taft-Hartley Act for the avoidance of conflicts between enforcement of federal policy by the National Labor Relations Board and the exertion of state power, it might be abstractly justifiable, as a matter of wooden logic, to suggest that an action in a state court by a member of a union for restoration of his membership rights is precluded. In such a suit there may be embedded circumstances that could constitute an unfair labor practice under § 8 (b) (2) of the Act. In the judgment of the [620]*620Board, expulsion from a union, taken in connection with other circumstances established in a particular case, might constitute an attempt to cause an employer to “discriminate against an employee with respect to whom membership in such organization has been denied or terminated on some ground other than his failure to tender the periodic dues and the initiation fees uniformly required as a condition of acquiring or retaining membership . . . 61 Stat. 141, 29 U. S. C. §158 (b)(2). But the protection of union members in their rights as members from arbitrary conduct by unions and union officers has not been undertaken by federal law, and indeed the assertion of any such power has been expressly denied. The proviso to § 8 (b)(1) of the Act states that “this paragraph shall not impair the right of a labor organization to prescribe its own rules with respect to the acquisition or retention of membership therein . . . .” 61 Stat. 141, 29 U. S. C. § 158 (b) (1). The present controversy is precisely one that gives legal efficacy under state law to the rules prescribed by a labor organization for “retention of membership therein.” Thus, to preclude a state court from exerting its traditional jurisdiction to determine and enforce the rights of union membership would in many cases leave an unjustly ousted member without remedy for the restoration of his important union rights. Such a drastic result, on the remote possibility of some entanglement with the Board’s enforcement of the national policy, would require a more compelling indication of congressional will than can be found in the interstices of the Taft-Hartley Act. See United Constr. Workers v. Laburnum Constr. Corp., 347 U. S. 656.
Although petitioners do not claim that the state court lacked jurisdiction to order respondent’s reinstatement, they do contend that it was without power to fill out this [621]*621remedy by an award of damages for loss of wages and suffering resulting from the breach of contract. No radiation of the Taft-Hartley Act requires us thus to mutilate the comprehensive relief of equity and reach such an incongruous adjustment of federal-state relations touching the regulation of labor. The National Labor Relations Board could not have given respondent the relief that California gave him according to its local law of contracts and damages. Although, if the unions’ conduct constituted an unfair labor practice, the Board might possibly have been empowered to award back pay, in no event could it mulct in damages for mental or physical suffering. And the possibility of partial relief from the Board does not, in such a case as is here presented, deprive a party of available state remedies for all damages suffered. See International Union, United Automobile Workers v. Russell, post, p. 634.
If, as we held in the Laburnum case, certain state causes of action sounding in tort are not displaced simply because there may be an argumentative coincidence in the facts adducible in the tort action and a plausible proceeding before the National Labor Relations Board, a state remedy for breach of contract also ought not be displaced by such evidentiary coincidence when the possibility of conflict with federal policy is similarly remote. The possibility of conflict from the court’s award of damages in the present case is no greater than from its order that respondent be restored to membership. In either case the potential conflict is too contingent, too remotely related to the public interest expressed in the Taft-Hartley Act, to justify depriving state courts of jurisdiction to vindicate the personal rights of an ousted union member. This is emphasized by the fact that the subject matter of the litigation in the present case, as the parties and the court conceived it, was the breach of a contract governing the [622]*622relations between respondent and his unions.
The judgment is
Affirmed.
Me. Justice Black took no part in the consideration or decision of this case.
“In determining the question of whether the exclusive jurisdiction to grant damages in a case of this kind lies in the Labor Relations Board, it is first necessary to determine the character of the pleadings and issues in this case. The petition alleged a breach of contract between the union and plaintiff, one of its members. ... It took the form of a petition for writ of mandate because damages alone would not be adequate to restore to petitioner the things of value he had lost by reason of the breach. No charge of 'unfair labor practices’ appears in the petition. The answer to the petition denied its allegations and challenged the jurisdiction of the court, but said nothing about unfair labor practices. The evidence adduced at the trial showed that plaintiff, because of his loss of membership, was unable to obtain employment and was thereby damaged. However, this damage was not charged nor treated as the result of an unfair labor practice but as a result of the breach of contract. Thus the question of unfair labor practice was not raised nor was any finding on the subject requested of, or made by, the court.” 142 Cal. App. 2d 207, 217, 298 P. 2d 92, 99.