Drukker Communications, with its wholly owned subsidiary, The Daily Advance, Inc., appeals under 29 U.S.C. § 160(f) (1976) the National Labor Relations Board’s adverse determination and order in an unfair labor practice action.under 29 U.S.C. § 158(a)(1), (5) (1976). The case presents the issue of *729 the Board’s power to withhold relevant testimony of one of its employees, and a number of issues regarding sufficiency of the complaint and factual support for the Board’s determination.
The basic facts, which will be supplemented during the course of our discussion, are as follows: On May 3, 1974, Newark Mailers’ Union Local 11 demanded that Union Building and Investment Company (UBI), then owner of The Daily Advance, recognize it as the collective bargaining agent for the newspaper’s circulation department employees. UBI declined recognition, and the union petitioned for certification by the NLRB. On May 28, representatives of the union and UBI met with George H. Abrams of the NLRB’s Regional Director’s Office and concluded a consent election agreement. The election was held on June 21, and the tally of unchallenged ballots showed that the union had lost by a 12-to-10 vote. The employer challenged five ballots, alleging that they had been cast by “motor route carriers” who were independent contractors and were outside the stipulated unit. After litigation which reached the Board level, the challenge was ultimately rejected and the ballots were opened and counted, producing a 15-to-12 union victory. The union was certified on September 7, 1976.
Between the time of the election and the certification, UBI changed its name to Drukker Communications, Inc., and sold all assets and liabilities of the newspaper to its wholly owned subsidiary, The Daily Advance, Inc. There is no indication in the record, nor has it been alleged, that the change was prompted by unionization of the company’s work force, or was anything other than a bona fide business decision. Either before or after the certification (for certain items the timing is in dispute) The Daily Advance unilaterally made a number of changes in its operations: It moved its mailroom from Dover to Roxbury, New Jersey, some eight miles away. It gradually phased out “motor route carriers” (who delivered papers owned by the newspapers for a fixed stipend) largely in favor of “delivery contract holders” (who bought papers and resold them at a profit, had the right to charge their customers a service fee, and in addition received a fixed stipend to assure profitability). It replaced the employee drivers of company-owned trucks with independent “hauling contract holders”; replaced district advisors with district sales representatives; and reduced a mail clerk from full-time to part-time status.
After certification, the company declined to bargain with the union. On February 14, 1977, the Board issued an unfair labor practice complaint against “Union Building and Investment Company T/A [trading as] The Daily Advance,” alleging refusal to recognize and bargain collectively with the union. An amendment to the complaint added the charges of changing terms and conditions of work without prior consultation with the union and bargaining directly with employees. In the proceedings before an administrative law judge (ALJ) the attorney for the companies raised all of the arguments that will be discussed below. The ALJ rejected them; he found that the companies had committed the unfair labor practices charged, and ordered them to cease and desist from such practices and to bargain concerning the unremedied effects of past violations. His opinion amended the name of respondent to read “Drukker Communications, Inc., and its wholly owned subsidiary The Daily Advance, Inc., formerly Union Building Investment Company T/A The Daily Advance.” The ALJ’s findings, conclusions and order were adopted by the Board with one modification — that the employer need not bargain over the move of the mail room, since the statute of limitations had run on that action.
Drukker Communications, Inc.,
Subpoena of Board Employee
Petitioner argues that the certification was invalid because the motor route carriers, whose challenged ballots tipped the scales in the election, were excluded from the unit by the May 28 stipulation. The basis of this contention is that the phrase *730 “[a]ll circulation department employees, including drivers,” contained in that portion of the stipulation describing the agreed-upon collective bargaining unit, was not intended to cover motor route carriers. Jt. App. at 58. The language bears the Board’s reading, and we would not normally disturb the agency’s reasonable judgment on a matter of interpretation. The dispute, however, centers about an alleged understanding or oral agreement at the time of the stipulation conference, to the effect that motor route carriers were not meant to be included in the unit. 1 On the basis of the evidence presented (consisting of conflicting testimony by the company’s lawyer on the one hand and the union’s lawyer on the other) the ALJ’s judgment that no oral understanding existed was also well within the bounds of the reasonable. Petitioner asserts, however, that all of the relevant evidence was not considered, because of the ALJ’s refusal to permit subpoena of George H. Abrams. Abrams was a Board employee in Region 22. He had been present at the conference which produced the stipulation, and had signed the document itself, as “Board Agent,” below a line reading “Recommended:”. • Jt.App. at - 53. Petitioner sought from the General Counsel the permission for Abrams’ testimony required by the Board’s rules, 29 C.F.R. § 102.118(a)(1) (1981). 2 When permission was refused, petitioner subpoenaed Abrams; the ALJ denied the motion to compel his testimony, and granted the General Counsel’s motion to quash the subpoena.
The National Labor Relations Act provides that “[t]he Board, or any member thereof, shall upon application of any party to [its] proceedings, forthwith issue to such party subpenas requiring the attendance and testimony of witnesses ... in such proceedings .... ” On application of the subpoenaed party, “the Board shall revoke ... such subpena if in its opinion the evidence whose production is required does not relate to ... any matter in question in such proceedings, or if in its opinion such subpena does not describe with sufficient particularity the evidence whose production is required.” 29 U.S.C. § 161(1) (1976). Although the statute explicitly permits the quashing of subpoenas only for irrelevance or lack of particularity, it does not explicitly exclude other grounds, and the availability of other grounds must certainly be implied — for example, to take an extreme instance, unwarranted interference with First Amendment rights. Thus, the Board’s delegation to administrative law judges of its subpoena authority properly (if somewhat illiterately) adds to the two grounds set forth in the statutory authority to quash “if for any other reason sufficient in law the subpena is otherwise [sic] invalid.” 29 C.F.R. § 102.31(b) (1981). Besides the subpoena section of the Act, two other provisions of law are pertinent. The formal adjudication provision of the Administrative Procedure Act, 5 U.S.C. § 556(d) (1976), which governed this proceeding, see 5 U.S.C. § 554(a) (1976), provides that “[a] *731 party is entitled to present his case or defense by oral or documentary evidence, to submit rebuttal evidence, and to conduct such cross-examination as may be required for a full and true disclosure of the facts.” NLRB unfair labor practice proceedings are also governed by another provision which, if not unique, is at least extraordinary, requiring that they “shall, so far as practicable, be conducted in accordance with the rules of evidence applicable in the district courts of the United States under the rules of civil procedure ....” 29 U.S.C. § 160(b) (1976).
Even in courts of law, relevant evidence sought from government officers is sometimes excluded, and a subpoena for it denied, because of a well founded claim that its production would, in one respect or another, harm the public interest:
Such, for example, are claims that the information sought would disclose confidential informants (Mitchell v. Bass,252 F.2d 513 [(8th Cir.1958)], state secrets (United States v. Reynolds,345 U.S. 1 ,73 S.Ct. 528 ,97 L.Ed. 727 [(1953)], military secrets (United States v. Reynolds, supra), or mental processes of those engaged in investigative or decisional functions (United States v. Morgan,313 U.S. 409 ,61 S.Ct. 999 ,85 L.Ed. 1429 [(1941)]; Appeal of Securities & Exchange Commission,226 F.2d 501 , 519 [(6th Cir. 1955)]).
General Engineering, Inc. v. NLRB,
The issue on which the testimony was sought was central to the case. On the basis of the legal assumptions applied by the ALJ and presumably adopted by the Board, if the alleged oral agreement existed, the challenged ballots should not have been counted, the union was not elected, the certification was invalid, and the unfair labor practices never occurred.
The issue did not pertain to the internal deliberations of the agency, see, e.g., International Ass’n of Machinists & Aerospace Workers, supra, nor to the accuracy or completeness of its investigative work product, see, e.g., J.H. Rutter Rex Mfg. Co., supra, and Stephens Produce Co., supra. *732 Rather, it concerned an external, operative event which an agency employee had witnessed. 4
The issue was quite specific — whether or not the conversations of the union and company representatives on a particular occasion manifested an intent to exclude a specific class of employees from their agreement — as opposed to more generalized “fishing expeditions” for helpful evidence which have uniformly been rejected, see, e.g., J.H. Rutter Rex Mfg. Go., supra.
The subpoenaing party’s version of the events, which will allegedly be sustained by the Board employee’s testimony, is highly plausible. The alleged understanding was not raised here, or even before the ALJ, for the first time. It was asserted in the initial challenge to the ballots lodged with the Regional Director,
see
Jt.App. at 58, on the union’s appeal of that initially successful challenge to the Board,
see id.
at 66, 88, before the hearing officer designated to determine the employee status of the motor route carriers,
see id.
at 76, 88, again before the Board in petitioner’s exceptions to the hearing officer’s report,
see id.
at 88, and again before the Regional Director in its objections to the election and the revised tally,
see id.
at 80, 81-82. It has been a consistent contention, formally asserted from the earliest time it could have been expected. Moreover, the nature of the alleged agreement is fully consistent with the language of the stipulation — or at least was at the time the stipulation was written. The stipulation places within the agreed-upon unit “[a]ll circulation department
employees, including drivers.”
Jt.App. at 53 (emphasis added). Motor route carriers are assuredly “drivers,” but whether they are employees is (or at least was) most doubtful. So much so that the Regional Director’s Report on Challenged Ballots recommended sustaining the company’s challenge on the sole ground that these individuals were not employees.
See
Jt.App. at 60, 65. In other words, petitioner is not urging an agreement which contradicts, or even makes an exception to, the language of the stipulation, except as that language has been given legal content (contrary to the views of the Regional Director) by subsequent Board decision. The ALJ found the company’s account not credible because it was “not likely that the Union’s lawyer brushed away what was then one-third of the Union’s supporters with a ‘we are not interested in them’ response based upon an alleged acceptance without question of a mere statement that they were independent contractors.”
The testimony was of unique value with regard to the issue. The only other witnesses who testified were aligned with the company or the union, and their testimony matched their alignment. The ALJ considered it dispositive of the subpoena issue that petitioner had not sought to introduce the testimony of two more of its employees who were present at the crucial meeting. The availability of other evidence is certainly a factor to be considered, but here the effect of that evidence upon the company’s case would at best have been cumulative. It cannot be compared with the supporting testimony of a neutral governmental official.
Participation of the Board employee in the events bearing upon the issue was of such a character that he was intended to acquire the knowledge which the subpoena seeks to elicit, and the parties would reasonably expect him to convey that knowledge to the Board. As counsel for petitioner (who had been present at the conference) described Abrams’ function (uncontradicted by counsel for the union, who had also been present), “he was assisting the parties to enter into the stipulation] for certification].” Jt.App. at 143 through unnumbered page after 143. He was also there to make sure that the stipulation, properly understood, was worthy of the Board’s approval, so that he could “recommend” it. On both scores, his participation was
designed
to inform him fully of the facts and circumstances bearing upon the meaning of the agreement; and on the latter score that knowledge was meant to affect the Board’s action. Thus, it was eminently reasonable for the parties to expect an employee in Abrams’ position to enlighten the Board on the events he was assigned to witness. And that is all the subpoena demands. The Board’s leading case giving effect to an oral agreement varying the content of a stipulation for certification emphasized the fact that the agreement was made “in the presence of a Board agent” and “before a Board agent.”
Banner Bedding, Inc.,
The proceeding is not a private action, but a complaint pressed by the Board itself against the party who asserts the need for the testimony. It is repugnant to notions of fairness for the government to seek sanctions for alleged wrongdoing while withholding from the proceeding evidence that would demonstrate innocence.
Cf. Brady v. Maryland,
The cumulative effect of all these considerations is to render the privilege inapplicable in this case. We recognize that the Board Agent’s action in midwifing a stipulation for certification is akin to agency mediation — which this court and others have found requires broad protection through the evidentiary privilege here at issue.
See NLRB v. Joseph Macaluso, Inc., supra; International Ass’n of Machinists & Aerospace Workers, supra.
In such a process it is, as we have said, essential that the government agency be “in the condition where it is persona grata to both parties.”
*734
We therefore find that the Board’s action must be set aside because it was taken without observance of procedure required by law, 5 U.S.C. § 706(2)(D) (1976). Although our holding on this point alone requires remand to the agency, we proceed to consider the other issues properly presented, 6 so that a repetitive appeal may be avoided.
Specificity of the Complaint
Petitioner asserts that the complaint did not specify each instance in which the employer failed to deal directly with the union, and objects to the ALJ’s refusal to require a bill of particulars. Not even the courts any longer require adherence to the technicalities of common law pleading. In NLRB cases, “[i]t is sufficient that the respondent ‘understood the issue and was afforded full opportunity to justify its actions.’ ”
Bakery Wagon Drivers & Salesmen, Local 484 v. NLRB,
Statute of Limitations
Petitioner argues that the six-month statute of limitations, 29 U.S.C. § 160(b) (1976), bars prosecution of several of the unilateral changes. It challenges the Board’s finding that “[w]ith the exception of the mailroom relocation, all the unilateral changes which the Administrative Law Judge found to be unlawful occurred after Respondent’s refusal to bargain on January 3, 1977.”
Liability of Parent Company
Petitioner argues that insufficient evidence existed for the conclusion that Drukker Communications, Inc., was vicariously liable for the unfair labor practices of The Daily Advance, Inc. The ALJ relied on three findings to support liability:
that all shares of The Daily Advance, Inc., are owned by Drukker Communications, Inc., and that The Daily Advance, Inc., is a wholly owned subsidiary of Drukker Communications, Inc., [2] that the officers and directors of Drukker Communications, Inc., and of The Daily Advance, Inc., are the same and that, [3] for the purposes of this proceeding, the change from Union Building and Investment Company trading as The Daily Advance to The Daily Advance, Inc., was a change in name only.
The last of these, if it was even meant as a factual determination rather than a conclusion of law, is contradicted by the record. Petitioner’s Amended Answer alleged that the assets and liabilities of the newspaper had been sold to the new corporation; this was never contested. The first two findings have support in the record, but are inadequate to sustain the conclusion of liability. To find a parent corporation liable for the unfair labor practices of its subsidiary under either an agency or integrated enterprise theory, the Board must find that the parent involved itself in the labor relations of the subsidiary.
See Bethlehem Steel Co. v. NLRB,
No evidence was presented to show such an involvement. The fact that The Daily Advance, Inc., was wholly owned by Drukker Communications, Inc., and that the officers and directors of the two corporations were identical does not make the actions of the one company automatically the actions of the other.
See Escude Cruz v. Ortho Pharmaceutical Corp.,
Employee Status op District Advisors [9] Petitioner attacks the finding that district advisors were properly included within the bargaining unit. It asserts that they were exempt “supervisors” within the meaning of the Act — which means supervisors of employees. There is no doubt that the district advisors recruited, trained, and replaced (which are activities potentially included among the supervisory functions listed in the Act, 29 U.S.C. § 152(11) (1976)) individuals whom we will only fleetingly, for the purpose of reader comprehension, describe as newsboys, but hereinafter call “youth carriers.” Petitioner’s ironic contention on this point is that the youth carriers
were
employees, so that the district advisors were supervisors of employees, and hence not employees, but supervisors. The ALJ’s only justification for his finding that the youth carriers were independent contractors was his assertion that “Respondent and the Union have been in agreement from the outset that the youngster carriers are not employees within the meaning of the Act (testimony of their respective lawyers, Hamburger and Parsonnet).”
Employee Status of Delivery Contract Holders
Petitioner challenges the finding that delivery contract holders were employees. It argues that since they derived their income principally from the difference between the wholesale and retail price of the papers they received, their status should have been controlled by the Board’s cases finding a newspaper distributor to be an independent contractor when his “income is based on the difference between the price at which he sells the papers, less the price he pays the Company for the papers and the labor costs and losses incurred.”
Las Vegas
*737
Sun, Inc.,
The process of developing rational principles through adjudication — especially principles of “mixed law and fact” of the sort at issue here — necessarily causes elements recited as determinative in an earlier case to be found nondeterminative in a later case where additional and perhaps unforeseen elements must be considered. This is the very nature of the adjudicatory, “case law” process. Thus, while a later case can justly be criticized for failure to distinguish an earlier one, the reverse cannot be true. Though circumstances may exist in which we would feel justified in requiring reformulation of an earlier Board decision in order to take account of a later case,
see Local 814, International Brotherhood of Teamsters v. NLRB,
Change of Location
Finally, petitioner claims that the change in the mailroom’s location, from Dover to Roxbury, renders the bargaining unit inappropriate. It argues that the stipulation was limited to the Dover plant, and that even if it were not, that the new locale overcomes the presumption of continuing majority support. The ALJ’s finding on this issue was supported by substantial evidence. Since the reference to the Dover location was contained in the stipulation’s jurisdictional provision, entitled “Commerce,” rather than in the section entitled “The Appropriate Collective Bargaining Unit,” it is reasonably interpreted as not specifically limiting the parties’ agreement on the latter point. Jt.App. at 52-53. And while a move in connection with other factors can eliminate the presumption of continuing majority support,
see NLRB v. Massachusetts Machine & Stamping, Inc.,
We grant the petition and remand the case to the Board for proceedings not inconsistent with this opinion.
Notes
. A portion of the administrative law judge’s decision suggests the adoption of a parol evidence rule that would render the existence of such an oral agreement irrelevant. That portion, however, is prefaced by the phrase “[i]n such circumstances,” referring to the immediately preceding discussion which found no “credible basis” for the alleged oral understanding.
. The rule reads in pertinent part as follows: (a)(1) [N]o regional director, field examiner, administrative law judge, attorney, specially designated agent, general counsel, member of the Board, or other officer or employee of the Board shall ... testify in behalf of any party to any cause pending in any court or before the Board ..., with respect to any information, facts, or other matter coming to his knowledge in his official capacity .... whether in answer to a subpoena or otherwise, without the written consent of ... the general counsel if the person is in a regional office of the agency ... and subject to the supervision or control of the general counsel.
. Telegram of John Irving to Henry Hamburger (June 7, 1978), JtApp. at 106. We are well aware that this response of the General Counsel was not carefully framed for the occasion at hand but was, to put it bluntly, boilerplate. See the strikingly similar statement provided in
Stephens Produce, supra,
. Petitioner asserted before the administrative law judge that Abrams’ testimony was needed for the purpose of showing his own understanding of the stipulation, on the theory that the Board was a party to it, and that the Board’s interpretation was therefore independently relevant. Had this been the only basis on which the company pressed for issuance of the subpoena, an entirely different issue would be presented. In fact, however, counsel also argued before the ALJ that Abrams was the only impartial witness of the contested agreement between the union and the company. Jt. App. at 506. That is the only basis which our discussion assumes to be relevant.
. There is also a fourth alternative, which is that each of the parties had a different intent, either expressed or unexpressed at the conference. This, however, must be excluded from the calculation — or included only to strengthen the plausibility of a state of facts that would vindicate the petitioner — since under the Board’s precedent such a failure of the parties to “reach a meeting of the minds [on] the stipulation” would invalidate it.
See Buckley Southland Oil,
. The petitioner makes a second attack upon the validity of the election, urging that it must be rerun because the motor route carriers received inadequate notice. Since there was no appeal to the Board from the administrative law judge’s disposition of this issue, it is foreclosed here. See
Detroit Edison Co. v. NLRB,
. The closest to it is the following statement, on cross-examination, of The Daily Advance’s Circulation Director:
Q Do the district sales representatives have any greater authority over the carriers than did the district advisors previously?
A Well any greater authority over the carriers? Again the carrier organization is the little merchant system.
I don’t know.
Maybe you mean the carriers are not employees?
Jt.App. at 346.
This would be slim evidence to support even a finding of independent contractor status— much less a finding that the company had conceded independent contractor status.
