opinion: Mr. Justice Marshall
  delivered the opinion of the Court.
  This case presents the question whether, when an employer has improperly failed to reinstate striking employees, and the National Labor Relations Board has after considerable delay ordered back pay for those employees, a court of appeals may, on account of the delay, modify the Board’s order to provide an early cutoff date for back pay. In the circumstances of this case, we hold such a modification to be an unwarranted interference with the Board’s remedial power to implement the policies of the National Labor Relations Act.
  I
  The employees in question chose the Amalgamated Clothing Workers of America, AFL-CIO, as their bargaining representative in January 1954. After three bargaining' sessions between the union and the company, the employees went out on strike in April 1954. At that point and thereafter the company refused to bargain further with the union representatives. Charges of unfair labor practices, including a refusal to bargain in good faith, were filed against the company. In April 1955, while these charges were pending, the union terminated the strike and applied for the reinstatement of many of the strikers. The company reinstated some of these employees and failed to reinstate others.
  In February 1956 the Board found that the company had indeed been guilty of an unlawful refusal to bargain. It ordered the company to offer reinstatement to all strikers who applied, and to “make such applicants whole for any loss of pay suffered by reason of the ... refusal, if any, to reinstate them.” J. H. Rutter-Rex Mfg. Co., 115 N. L. R. B. 388, 391 (1956). As is apparently the Board’s practice in reinstatement cases involving strikers, the order did not name the individuals covered, but left disputes over the details of reinstatement and back pay to the compliance stage of the proceedings. The Court of Appeals enforced the Board’s order, NLRB v. J. H. Rutter-Rex Mfg. Co., 245 F. 2d 594 (C. A. 5th Cir. 1957), and entered its decree on August 19, 1957.
  On August 21, 1957, the Board’s regional office sent the company the standard letter describing compliance procedures, which included the following:
  “When you have fully complied with the affirmative terms of the Decree and there are no violations of its negative provisions, you will be notified that the case has been closed. Until you receive such notice you will know that the case still remains open for all purposes as awaiting compliance.”
  On November 7, 1957, the company wrote to the regional office stating that it had complied with “some of the provisions of the decree,” and asking that the regional office bring “any instance of a failure to fully comply with the order” to the company’s attention. The regional office did not answer this letter, and the company heard nothing until March 22, 1960, when a Board compliance officer notified the company that the case had been assigned to him, and requested payroll and other records necessary to determine the employment and back-pay rights of employees.
  On November 16, 1961, the regional office filed a 428-page back-pay specification, alleging that the company owed more than $342,000 to some 207 strikers who had either not been reinstated within five days after applying, or who had never been reinstated, in violation of the Board and court orders. The company applied to the Court of Appeals for a permanent stay of further action in the back-pay proceedings, alleging that the Board had delayed improperly in issuing the specification. By affidavit, the Board explained that the delay was caused in part by the great complexity of the task of processing the claims of approximately 600 strikers, and in part by the extremely heavy caseload and severe limitations in staff that the New Orleans regional office experienced during the late 1950’s. The Court of Appeals noted that the delay was regrettable, but denied the requested stay. NLRB v. J. H. Rutter-Rex Mfg. Co., 305 F. 2d 242 (C. A. 5th Cir. 1962).
  After a lengthy hearing, a Trial Examiner denied back pay to 35 of the 207 claimants, and reduced the amount due to just over $160,000. He determined that each employee should receive net back pay, computed according to the Board’s usual formula, for the period running from five days after his application for reinstatement until the company made a complying offer. Where no offer was made, the back pay was to accrue through the last quarter of 1961, the quarter in which the specification was filed. His findings and recommendations were adopted with minor modifications by the Board on June 6, 1966. J. H. Rutter-Rex Mfg. Co., 168 N. L. R. B. 1414 (1966). Both the Examiner and the Board considered and rejected the company’s contention that the delay in issuing the specification should bar the back-pay award, either in whole or in part.
  On review, the Court of Appeals found that the Board had been guilty of “inordinate” delay, in violation of § 6 (a) of the Administrative Procedure Act, 60 Stat. 240, 5 U. S. C. § 1005 (a), now 5 U. S. C. § 555 (b) (1964 ed., Supp. IV), and to the prejudice of the company, which had been “lulled into the belief that the Board was satisfied and that no further action was to be expected.” J. H. Rutter-Rex Mfg. Co. v. NLRB, 399 F. 2d 356, 363 (C. A. 5th Cir. 1968). Arguing that the purpose of back-pay awards is to “deter unfair labor practices,” id., at 364, and believing that a substantial award of back pay would be sufficient to achieve such deterrent effect, the court modified the Board order to eliminate all back pay accruing after July 1, 1959, thus reducing the awards of some 37 strikers who had not yet received complying offers of reinstatement by that date. We granted certiorari to consider the propriety of this modification, 393 U. S. 1116 (1969), and we reverse the judgment below.
  II
  We start with the broad command of § 10 (c) of the National Labor Relations Act, as amended, 61 Stat. 147, 29 U. S. C. § 160 (c), that upon finding that an unfair labor practice has been committed, the Board shall order the violator “to take such affirmative action including reinstatement of employees with or without back pay, as will effectuate the policies” of the Act. This Court has stated that the remedial power of the Board is “a broad discretionary one, subject to limited judicial review.” Fibreboard Corp. v. NLRB, 379 U. S. 203, 216 (1964).
  The legitimacy of back pay as a remedy for unlawful discharge or unlawful failure to reinstate is beyond dispute, Mastro Plastics Corp. v. NLRB, 350 U. S. 270, 278 (1956), and the purpose of the remedy is clear. “A back pay order is a reparation order designed to vindicate the public policy of the statute by making the employees whole for losses suffered on account of an unfair labor practice.” Nathanson v. NLRB, 344 U. S. 25, 27 (1952). As with the Board’s other remedies, the power to order back pay “is for the Board to wield, not for the courts.” NLRB v. Seven-Up Bottling Co., 344 U. S. 344, 346 (1953). “When the Board, ‘in the exercise of its informed discretion,’ makes an order of restoration by way of back pay, the order ‘should stand unless it can be shown that the order is a patent attempt to achieve ends other than those which can fairly be said to effectuate the policies of the Act.’ ” Id., at 346-347.
  Here the Board ordered back pay through December 1961 for employees who had not yet received complying offers of reinstatement by that date. That order clearly falls within the general purpose of making the employees whole, and thus restoring the economic status quo that would have obtained but for the company’s wrongful refusal to reinstate them. The employees encompassed by the order earned less during the relevant quarterly periods than they would have, had they been reinstated in their old or substantially equivalent jobs with the company. Thus the Court of Appeals’ modification, cutting off the accrual of back pay at the arbitrary date of July 1, 1959, left the employees who had not been reinstated by that date worse off than they would have been but for the company’s wrongful action in refusing reinstatement. Either the company or the employees had to bear the cost of the Board’s delay. The Board placed that cost upon the company, which had wrongfully failed to reinstate the employees. In an effort to discipline the Board for its delay, the court shifted part of that cost from the wrongdoing company to the innocent employees.
  The Court of Appeals justified the modification as a proper balancing of the interests of the company, which it found was prejudiced in litigating the back-pay claims by the Board’s delay, and the interests of the employees in full restitution. It found statutory support for the company’s position in what it took to be the Board’s violation of its duty under the Administrative Procedure Act to “proceed with reasonable dispatch to conclude any matter presented to it.” 5 U. S. C. § 1005 (a). Thus, the Court of Appeals reasoned, the case fell within the admonition that reviewing courts in labor cases not “rubber-stamp their affirmance of administrative decisions that they deem inconsistent with a statutory mandate or that frustrate the congressional policy underlying a statute.” NLRB v. Brown, 380 U. S. 278, 291 (1965).
  Assuming without deciding that the delay in issuing the specification did violate the Board’s duty of prompt action under the Administrative Procedure Act, it does not follow that enforcement of the full back-pay remedy was an abuse of the Board’s discretion. Wronged employees are at least as much injured by the Board’s delay in collecting their back pay as is the wrongdoing employer. In view of “the economic hardship caused by many years of undeservedly substandard earnings,” lengthy delays “must render the back pay award a wholly inadequate and unsatisfactory remedy” to the employees for the company’s refusal to reinstate them. NLRB v. Mastro Plastics Corp., 354 E. 2d 170, 180 (C. A. 2d Cir. 1965). This Court has held before that the Board is not required to place the consequences of its own delay, even if inordinate, upon wronged employees to the benefit of wrongdoing employers. NLRB v. Electric Cleaner Co., 315 U. S. 685, 698 (1942); Labor Board v. Katz, 369 U. S. 736, 748 n. 16 (1962).
  The Court of Appeals reasoned further that the purpose of the back-pay remedy is deterrence of unfair labor practices, and that the substantial back-pay award that it enforced would sufficiently serve that deterrent purpose. But the Board could properly conclude that back pay is not only punishment for an unfair labor practice, but is also a remedy designed to restore, so far as possible, the status quo that would have obtained but for the wrongful act. Cf. Phelps Dodge Corp. v. NLRB, 313 U. S. 177, 194 (1941).
  Finally, the Court of Appeals reasoned that the company was “lulled into the belief that the Board was satisfied and that no further action was to be expected.” 399 F. 2d, at 363. We need not decide whether this sort of estoppel argument would justify a court in reducing a back-pay award, for no estoppel appears in this case. The Board clearly informed the company that this case would remain open as awaiting compliance until the company received a notice that the case was closed. No such closing notice was ever given. As the Court of Appeals itself stated, the company’s subsequent letter asking that violations of the order be called to its attention “could not shift or avoid its duty of compliance.” Ibid.
  We do not mean that delay in the administrative process is other than deplorable. It is deplorable if, as the Court of Appeals thought, the company was hampered in the presentation of its defenses to the back-pay specification by the delay. It is even more deplorable if, as seems clear, innocent employees had to live for some years on reduced incomes as a combined result of the delay and the company’s illegal failure to reinstate them. It may be that the company could have, through the courts, compelled earlier Board action. But the Court of Appeals exceeded the narrow scope of review provided for the Board’s remedial orders when it shifted the cost of the delay from the company to the employees in this case.
  Reversed.
  NLRB v. Seven-Up Bottling Co., 344 U. S. 344, 345 (1953).
  The Court of Appeals also reversed back-pay awards as to 10 strikers in their entirety, finding the awards not supported by substantial evidence. 399 F. 2d, at 365. Certiorari was not sought as to this modification of the Board’s order.
  Section 10 (e) (A) of the Administrative Procedure Act, 5 U. S. C. § 1009 (e) (A), now 5 II. S. C. § 706 (1) (1964 ed., Supp. IV), provides that courts shall “compel agency action unlawfully withheld or unreasonably delayed.”
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