Justice Brennan
delivered the opinion of the Court.
The question presented is whether an employee who, in the course of his employment, may have access to information considered confidential by his employer is impliedly ex-[172]*172eluded from the definition of “employee” in §2(3) of the National Labor Relations Act and denied all protections under the Act.1
I
We have before us two cases under the same docket number. We shall first state separately the factual and procedural background of each.
The Hendricks case
Mary Weatherman was the personal secretary to the general manager and chief executive officer of respondent Hendricks County Rural Electric Membership Corp. (Hendricks), a rural electric membership cooperative. She had been employed by the cooperative for nine years. In May 1977 she signed a petition seeking reinstatement of a close friend and fellow employee, who had lost his arm in the course of employment with Hendricks, and had been dismissed. Several days later she was discharged.
Weatherman filed an unfair labor practice charge with the National Labor Relations Board (NLRB or Board), alleging that the discharge violated § 8(a)(1) of the National Labor Relations Act (NLRA or Act), 29 U. S. C. § 158(a)(1). Hendricks’ defense, inter alia, was that Weatherman was denied [173]*173the Act’s protection because as a “confidential” secretary she was impliedly excluded from the Act’s definition of “employee” in § 2(3). The Administrative Law Judge (ALJ) rejected this argument. He noted that the Board’s decisions had excluded from bargaining units only those “confidential employees . . . [‘]who assist and act in a confidential capacity to persons who formulate, determine, and effectuate management policies in the field of labor relations.’” 236 N. L. R. B. 1616, 1619 (1978), quoting B. F. Goodrich Co., 115 N. L. R. B. 722, 724 (1956). Applying this “labor nexus” test, the ALJ found that Weatherman was not in any event such a “confidential employee.”2 He also determined that Hendricks had discharged Weatherman for activity — signing the petition — protected by §7 of the Act, 29 U. S. C. §157.3 The ALJ thus sustained Weatherman’s unfair labor practice charge. The Board affirmed “the rulings, findings, and conclusions of the Administrative Law Judge,” and ordered that Weatherman be reinstated with backpay. 236 N. L. R. B., at 1616.
Hendricks sought review in the United States Court of Appeals for the Seventh Circuit and the Board cross-petitioned for enforcement. A divided panel of the court reversed and remanded for further proceedings. 603 F. 2d 25 (1979). Although the majority agreed with the Board’s factual finding that Weatherman did not “assist in a confidential capacity with respect to labor relations policies,” id., at 28, the majority, relying on language in a footnote to NLRB v. Bell Aero-
[174]*174space Co., 416 U. S. 267, 284, n. 12 (1974), held that “all secretaries working in a confidential capacity, without regard to labor relations, [must] be excluded from the Act.” 603 F. 2d, at 30.4 The Court of Appeals therefore remanded for a determination whether Weatherman came within this substantially broader definition of confidential secretary.
On remand, the Board found that Weatherman was not privy to the Confidences of her employer and thus concluded that she did not fall within the broader definition of confidential secretary that the Court of Appeals had directed the Board to apply. 247 N. L. R. B. 498 (1980).5 Hendricks again petitioned for review and the Board cross-petitioned for enforcement. The Court of Appeals, by a divided panel, denied enforcement. 627 F. 2d 766 (1980). The majority held that the Board had “actually reapplie[d] the old standard incorporating the labor nexus,” and that the evidence in the [175]*175record failed to support a finding that Weatherman did not come within the court’s broader definition of confidential secretary. Id., at 770.6
The Malleable case
This case grew out of efforts of the Office and Professional Employees International Union (Union) to represent, as collective-bargaining agent, various employees of respondent Malleable Iron Range Co. (Malleable). In December 1978 the Union sought certification as the collective-bargaining representative for a unit of office clerical, technical, and professional personnel employed at the respondent’s facility in Beaver Dam, Wis. At the subsequent representation hearing, Malleable challenged the inclusion of 18 employees in the unit on the ground that they had access to confidential business information. The Regional Director of the NLRB rejected Malleable’s objection, concluding that none of the challenged 18 employees was a confidential employee under the Board’s “labor nexus” test. App. to Pet. for Cert. 76a-94a. The Union prevailed in a later representation election, and was accordingly certified as the bargaining agent for the unit. Malleable nevertheless refused to bargain with the Union. Seeking relief, the Union filed unfair labor practice charges with the NLRB. The Board found that Malleable’s refusal to bargain violated §§ 8(a)(5) and (1) of the Act, 29 U. S. C. §§ 158(a)(5) and (1), and issued a bargaining order. 244 N. L. R. B. 485 (1979).
Malleable petitioned the Court of Appeals for the Seventh Circuit for review of the order and the Board cross-petitioned for enforcement. In an unreported opinion, a divided panel of the court denied enforcement. App. to Pet. for Cert. [176]*17656a-60a. Order denying enforcement, 681 F. 2d 734 (1980). The majority noted that the Regional Director, in determining that none of the 18 individuals was a confidential employee, had applied the Board’s labor-nexus test which the Seventh Circuit had rejected in the earlier decisions involving Hendricks. The court remanded the case to the Board for reconsideration consistent “with the Hendricks case.” App. to Pet. for Cert. 56a, 59a.
We granted the Board’s petition for certiorari in both cases to resolve the conflict among the Courts of Appeals respecting the propriety of the Board’s practice of excluding from collective-bargaining units only those confidential employees with a “labor nexus,” while rejecting any claim that all employees with access to confidential information are beyond the reach of §2(3)’s definition of “employee.”7 450 U. S. 964 (1981). We hold that there is a reasonable basis in law for the Board’s use of the “labor nexus” test. We therefore reverse the judgments of the Court of Appeals, with directions in the Hendricks case to enforce the Board’s order,8 and with [177]*177directions in the Malleable case for further proceedings consistent with this opinion.
II
Section 2(3) of the NLRA provides that the “term ‘employee’ shall include any employee ...” (emphasis added), with certain stated exceptions such as “agricultural laborers,” “supervisors” as defined in §2(11), and “independent contractors.”9 Under a literal reading of the phrase “any employee,” then, the workers in question are “employees.” But for over 40 years, the NLRB, while rejecting any claim that the definition of “employee” in § 2(3) excludes confidential employees, has excluded from the collective-bargaining units determined under the Act those confidential employees satisfying the Board’s labor-nexus test. Respondents Hendricks and Malleable (hereafter respondents) argue that contrary to the Board’s practice, all employees who may have access to confidential business information are impliedly excluded from the definition of employee in § 2(3).
In assessing the respondents’ argument, we must be mindful of the canon that “the construction of a statute by those charged with its execution should be followed unless there are compelling indications that it is wrong, especially where Congress has refused to alter the administrative construction.” Red Lion Broadcasting Co. v. FCC, 395 U. S. 367, 381 (1969) (footnote omitted); see NLRB v. Bell Aerospace Co., 416 U. S., at 274-275; Zemel v. Rusk, 381 U. S. 1, 11-12 (1965). We therefore proceed to review the Board’s determinations from 1940 to 1946 whether confidential employees were “employees” within § 2(3) of the NLRA (Wagner Act), and then determine whether Congress, when it considered those determinations in enacting the Labor Management Relations Act of 1947 (Taft-Hartley Act), intended to alter the Board’s practice.
[178]*178A
In 1935 the Wagner Act became law. 49 Stat. 449. The Act’s broad objectives were to “encourag[e] the practice and procedure of collective bargaining and . . . protec[t] the exercise by workers of full freedom of association, self-organization, and designation of representatives of their own choosing, for the purpose of negotiating the terms and conditions of their employment or other mutual aid or protection.” Id., at 449-450. The employees covered by the Act were defined in §2(3): “The term ‘employee’ shall include any employee . . . but shall not include any individual employed as an agricultural laborer, or in the domestic service of any family or person at his home, or any individual employed by his parent or spouse.” Although the Act’s express exclusions did not embrace confidential employees, the Board was soon faced with the argument that all individuals who had access to confidential information of their employers should be excluded, as a policy matter, from the definition of “employee.” The Board rejected such an implied exclusion, finding it to have “no warrant under the Act.” Bull Dog Electric Products Co., 22 N. L. R. B. 1043, 1046 (1940). See also Creamery Package Manufacturing Co., 34 N. L. R. B. 108, 111 (1941). But in fulfilling its statutory obligation to determine appropriate bargaining units under §9 of the Act, 29 U. S. C. §159, for which broad discretion has been vested in the Board, see Packard Motor Car Co. v. NLRB, 330 U. S. 485, 491-492 (1947); Pittsburgh Plate Glass Co. v. NLRB, 313 U. S. 146 (1941), the Board adopted special treatment for the narrow group of employees with access to confidential, labor-relations information of the employer. The Board excluded these individuals from bargaining units composed of rank- and-file workers.10 See, e. g., Brooklyn Daily Eagle, 13 [179]*179N. L. R. B. 974, 986 (1939); Creamery Package Manufacturing Co., supra, at 110. The Board’s rationale was that “management should not be required to handle labor relations matters through employees who are represented by the union with which the [c]ompany is required to deal and who in the normal performance of their duties may obtain advance information of the [cjompany’s position with regard to contract negotiations, the disposition of grievances, and other labor relations matters.” Hoover Co., 55 N.L.R.B. 1321, 1323 (1944).
Following its formulation, through 1946, the Board routinely applied the labor-nexus test in numerous decisions to identify those individuals who were to be excluded from bargaining units because of their access to confidential information.11 And in at least one instance in which a Court of Ap[180]*180peals had occasion to review the Board’s application of a labor-nexus test under the Wagner Act, the test was upheld. NLRB v. Poultrymen’s Service Corp., 138 F. 2d 204, 210-211 (CA3 1943). See also NLRB v. Armour & Co., 154 F. 2d 570, 573-574 (CA10 1945); Polish National Alliance v. NLRB, 136 F. 2d 175, 180 (CA7 1943), aff’d, 322 U. S. 643 (1944).
In 1946, in Ford Motor Co., 66 N. L. R. B. 1317, 1322, the Board refined slightly the labor-nexus test because in its view the “definition [was] too inclusive and needlessly preclude[d] many employees from bargaining collectively together with other workers having common interests.” Henceforth, the Board announced, it intended “to limit the term ‘confidential’ so as to embrace only those employees who assist and act in a confidential capacity to persons who [181]*181exercise ‘managerial’ functions in the field of labor relations.”12 This was the state of the law in 1947 when Congress amended the NLRA through the enactment of the Taft-Hartley Act. 61 Stat. 136.
B
Although the text of the Taft-Hartley Act also makes no explicit reference to confidential employees, when Congress addressed the scope of the NLRA’s coverage, the status of confidential employees was discussed. But nothing in that legislative discussion supports any inference, let alone conclusion, that Congress intended to alter the Board’s pre-1947 determinations that only confidential employees with a “labor nexus” should be excluded from bargaining units. Indeed, the contrary appears.
The Taft-Hartley Act was in part a response to the Court’s decision in Packard Motor Car Co. v. NLRB, 330 U. S. 485 (1947), which upheld the Board’s certification of a bargaining unit composed of plant foremen. See NLRB v. Bell Aerospace Co., 416 U. S., at 279. Although the House and Senate initially passed differing bills, both Houses explicitly excluded “supervisors” from the definition of “employee” in the NLRA. H. R. 3020, 80th Cong., 1st Sess., § 2(3) (1947); S. 1126, 80th Cong., 1st Sess., §2(3) (1947). In defining the term “supervisor,” however, the bills differed substantially. The House bill defined “supervisor” to include within its scope the confidential employee, broadly defined as one “who by the nature of his duties is given by the employer information that is of a confidential nature, and that is not available to the public, to competitors, or to employees generally, for [182]*182use in the interest of the employer.”13 The Senate, on the other hand, did not include the confidential employee within its definition of “supervisor.”14
The differing House and Senate bills were submitted to a Conference Committee. In Committee, the Senate definition of “supervisor,” with no reference to confidential em[183]*183ployees, prevailed. As described in the statement of the House Managers, appended to the Conference Report:
“The conference agreement, in the definition of ‘supervisor,’ limits such term to those individuals treated as supervisors under the Senate amendment. In the case of persons working in the labor relations, personnel and employment departments, it was not thought necessary to make specific provision, as was done in the House bill, since the Board has treated, and presumably will continue to treat, such persons as outside the scope of the act. This is the prevailing Board practice with respect to such people as confidential secretaries as well, and it was not the intention of the conferees to alter this practice in any respect.” H. R. Conf. Rep. No. 510, 80th Cong., 1st Sess., 35 (1947).15
With this understanding, both Houses adopted the Conference Report, 93 Cong. Rec. 6393 (1947) (House); id., at 6536 [184]*184(Senate). Although President Truman vetoed the Taft-Hartley bill, see id., at 7485-7488 (veto message), the bill nevertheless became law when Congress successfully overrode the veto, id., at 7489 (House); id., at 7538 (Senate).
The Court of Appeals interpreted the legislative history of Congress’ exclusion of “supervisors” from the definition of “employees” as warranting an implied exclusion for all workers who may have access to confidential business information of their employer. That interpretation must be rejected. It is flatly belied by the Conference Committee’s rejection of the House proposal of an exclusion of all confidential employees — for obviously the House conceded on this issue to the Senate.16
Indeed, the Taft-Hartley Act’s express inclusion of “professional employees” under the Act’s coverage17 negates any reading of the legislative history as excluding confidential employees generally from the definition of employee in § 2(3). The definition of professional employees was intended to cover “such persons as legal, engineering, scientific and med[185]*185ical personnel together with their junior professional assistants.” H. R. Conf. Rep..No. 510, 80th Cong., 1st Sess., 36 (1947).18 But surely almost all such persons would likely be privy to confidential business information and thus would fall within the broad definition of confidential employee excluded under the House bill. It would therefore be extraordinary to read an implied exclusion for confidential employees into the statute that would swallow up and displace almost the entirety of the professional-employee inclusion.
Plainly, too, nothing in the legislative history of the Taft-Hartley Act provides any support for the argument that Congress disapproved the Board’s prior practice of applying a labor-nexus test to identify confidential employees whom the Board excluded from bargaining units. To the contrary, the House Managers’ statement accompanying the Conference Committee Report indicates that Congress intended to leave the Board’s historic practice undisturbed.19
[186]*186HH h-4 h-(
The Court of Appeals, and the respondents here, rely on dictum in a footnote to NLRB v. Bell Aerospace Co., 416 U. S. 267 (1974), to suggest that the 80th Congress believed that all employees with access to confidential business information of their employers had been excluded from the Wagner Act by prior NLRB decisions and that Congress intended to freeze that interpretation of the Wagner Act into law. The Bell Aerospace dictum is:
“In 1946 in Ford Motor Co., 66 N. L. R. B. 1317, 1322, the Board had narrowed its definition of ‘confidential employees’ to embrace only those who exercised ‘“managerial” functions in the field of labor relations.’ The dis[187]*187cussion of ‘confidential employees’ in both the House and Conference Committee Reports, however, unmistakably refers to that term as defined in the House bill, which was not limited just to those in ‘labor relations.’ Thus, although Congress may have misconstrued recent Board practice, it clearly thought that the Act did not cover ‘confidential employees’ even under a broad definition of that term.” Id,., at 284, n. 12.
Obviously this statement was unnecessary to the determination whether managerial employees are excluded from the Act, which was the question decided in Bell Aerospace. In any event, the statement that Congress “clearly thought that the Act did not cover ‘confidential employees,’ even under a broad definition of that term,” is error. The error is clear in light of our analysis above of the legislative history of the Taft-Hartley Act pertinent to the question. Moreover, the footnote erroneously implies that Ford Motor Co., 66 N. L. R. B. 1317 (1946), marked a major departure from the Board’s prior practice. To the contrary, that Board decision introduced only a slight refinement of the labor-nexus test which the Board had applied in numerous decisions from 1941 to 1946. See n. 11, supra. Certainly the Conference Committee, in approving the Board’s “prevailing practice,” was aware of the Board’s line of decisions.20 Cf. Cannon v. Uni[188]*188versity of Chicago, 441 U. S. 677, 696-699 (1979). Thus the only plausible interpretation of the Report is that, in describing the Board’s prevailing practice of denying certain employees the full benefits of the Wagner Act, the Report referred only to employees involved in labor relations, personnel and employment functions, and confidential secretaries to such persons. For that, in essence, is where the Board law as of 1947 stood. It follows that the dictum in Bell Aerospace, and the Court of Appeals’ reliance upon it, cannot be squared with congressional intent, and should be “recede[d] from” now that the issue of the status of confidential employees is “squarely presented.” NLRB v. Boeing Co., 412 U. S. 67, 72 (1973).
We also find no merit in the respondents’ argument that the Board has applied the labor-nexus test inconsistently. As noted earlier, supra, at 178-181, the Board, in excluding “confidential employees” from bargaining units, routinely applied such a test in the six years preceding the enactment of Taft-Hartley. In the years following the passage of the Taft-Hartley Act, the Board continued to apply the labor-nexus criterion in determining whether individuals were to be excluded from bargaining units as confidential employees. In B. F. Goodrich Co., 115 N. L. R. B. 722 (1956), the Board [189]*189reaffirmed its previous ruling in Ford Motor and underscored its intention “in future cases ... to limit the term ‘confidential’ so as to embrace only those employees who assist and act in a confidential capacity to persons who formulate, determine, and effectuate management policies in the field of labor relations.” 115 N. L. R. B., at 724 (footnote omitted) (emphasis deleted).21 In succeeding years, while continuing to apply the labor-nexus test, the Board has deviated from that stated intention in only one major respect: it has also, on occasion, consistent with the underlying purpose of the labor-nexus test, see supra, at 179, designated as confidential employees persons who, although not assisting persons exercising managerial functions in the labor-relations area, “regularly have access to confidential information concerning anticipated changes which may result from collective-bargaining negotiations.” Pullman Standard Division of Pullman, Inc., 214 N. L. R. B. 762, 762-763 (1974); see Triangle Publications, Inc., 118 N. L. R. B. 595, 596, and nn. 3-4 (1957).
In sum, our review of the Board’s decisions indicates that the Board has never followed a practice of depriving all employees who have access to confidential business information from the full panoply of rights afforded by the Act. Rather, for over 40 years, the Board, while declining to create any implied exclusion from the definition of “employee” for confidential employees, has applied a labor-nexus test in identifying those employees who should be excluded from bargaining units because of access to confidential business information.22 We cannot ignore this consistent, longstanding [190]*190interpretation of the NLRA by the Board. See Bell Aerospace, 416 U. S., at 275; Red Lion Broadcasting Co. v. FCC, 395 U. S., at 381.
IV
The Court’s ultimate task here is, of course, to determine whether the Board’s “labor nexus” limitation on the class of confidential employees who, although within the definition of “employee” under § 2(3), may be denied inclusion in bargaining units has “a reasonable basis in law.” See Ford Motor Co. v. NLRB, 441 U. S. 488, 497 (1979); Chemical Workers v. Pittsburgh Plate Glass Co., 404 U. S. 157, 166 (1971); NLRB v. Hearst Publications, Inc., 322 U. S. 111, 131 (1944). Clearly the NLRB’s longstanding practice of excluding from bargaining units only those confidential employees satisfying the Board’s labor-nexus test, rooted firmly in the Board’s understanding of the nature of the collective-bargaining process, and Congress’ acceptance of that practice, fairly demonstrates that the Board’s treatment of confidential employees does indeed have “a reasonable basis in law.” We therefore return finally to the disposition of the cases before us.
Hendricks
In Hendricks, the Board determined that the personal secretary, Mary Weatherman, was not a confidential secretary because she “did not act ‘in a confidential capacity’ ” with respect to labor-relations matters. 236 N. L. R. B., at 1619. While the Court of Appeals affirmed this finding, it denied enforcement of the Board’s order on the basis that the evidence failed to support the Board’s additional finding, required by the Court of Appeals, that Weatherman had no access to confidential wow-labor-related information. In [191]*191approving the Board’s limited labor-nexus exclusion, we have held that such a finding is irrelevant to the determination of whether the secretary was a confidential employee. In this Court respondent Hendricks does not argue that Weatherman came within the labor-nexus test as formulated by the Board, but rather concedes that Weatherman did not have “confidential duties ‘with respect to labor policies.’” Brief for Respondent Hendricks 43. Because there is thus no dispute in this respect, and in any event no suggestion that the Board’s finding regarding labor nexus was not supported by substantial evidence, we conclude that the Court of Appeals erred in holding that the record did not support the Board’s determination that Weatherman was not a confidential employee with a labor nexus.23 We therefore reverse the judgment of the Court of Appeals in Hendricks insofar as enforcement of the Board’s order was denied, and remand with directions to enter an order enforcing the Board’s order.
Malleable
In Malleable, as well, the respondent makes no argument that the 18 employees in question satisfy the labor-nexus test of the Board. Rather, Malleable argues, and the Court of Appeals held, that the Board should have applied a broader definition of confidential employee to include all employees in possession of confidential business information. Having rejected the broad exclusion on which the Court of Appeals’ judgment relies, we reverse that judgment. But because the Court of Appeals has not yet addressed Malleable’s con[192]*192tentions that some of the 18 employees should have been excluded from the bargaining unit for reasons entirely unrelated to whether they are confidential employees,24 we remand Malleable for further proceedings consistent with this opinion.
It is so ordered.