Opinion for the Court filed by Circuit Judge ROGERS.
The parties are before the court for the third time as a result of a labor dispute that began over sixteen years ago. In 1981, petitioners District Lodge 64 of the International Association of Machinists and Aerospace Workers, AFL-CIO, and its Local Lodges 883, 1088, and 1142 (hereinafter “IAM” or “the union”) filed a series of charges with the National Labor Relations Board (“the Board”) alleging bad faith bargaining by Brown & Sharpe Manufacturing Co. (“Brown & Sharpe” or “the company”). The General Counsel of the Board dismissed the charges and refused to issue an unfair labor practice complaint, but later attempted to reinstate the charges on the basis of newly discovered evidence uncovered during the investigation of a separate unfair labor practice charge filed by the union against Brown & Sharpe.
To date, this litigation has concerned only a preliminary procedural issue: whether the General Counsel’s attempt to reinstate the dismissed charges was valid under the Board’s precedent. In Ducane Heating Corp.,
I.
IAM’s charges centered around the assertion that Brown & Sharpe engaged in illegal “surface bargaining.” See International Ass’n of Machinists & Aerospace Workers v. NLRB,
Whatever the company’s intent, in fact, the sides could not reach agreement on these two key issues and others, and on October 18, 1981, the members of IAM went on strike. Shortly thereafter, on November 5,1981, and March 18,1982, IAM filed timely unfair labor practice charges against Brown & Sharpe for bargaining with no good faith intention of trying to reach agreement, in violation of sections 8(a)(1) and 8(a)(5) of the National Labor Relations Act (“the Act”), 29 U.S.C. § 158(a)(1), (5) (1988). See Int’l Ass’n of Machinists,
Seven months later, on July 30, 1982, a former manager of Brown & Sharpe sued the company for wrongful discharge, claiming that he had been fired for his refusal to engage in surface bargaining. See Int’l Ass’n of Machinists,
Brown & Sharpe denied the charge of surface bargaining and also claimed that the General Counsel’s complaint included dismissed claims improperly reinstated after a time bar came into effect. Section 10(b) of the Act provides that “no complaint shall issue based upon any unfair labor practice occurring more than six months prior to the filing of the charge with the Board.” 29 U.S.C. § 160(b). As a corollary, the Ducane rule forbids the General Counsel from rein
The Board affirmed the ALJ’s decision, but on a different ground. The Board found that regardless of whether Brown & Sharpe had fraudulently concealed the steering committee documents, this evidence did not constitute “operative facts” relevant to the violation and consequently would not support reinstatement of the charges under the Ducane rule. See Brown & Sharpe Mfg. Co.,
On remand, the Board withdrew its use of the term “operative facts” and purported instead to apply the standard of “material facts” from this court’s opinion in Fitzgerald v. Seamans,
concealed evidence is “material” if it would make a critical difference between establishing a violation and not doing so. Thus, if the absence of that evidence results in the dismissal or withdrawal of the charge, the subsequent discovery of that evidence will permit the resurrection of the charge....
Id. at 445. On review of the Board’s second order, the court rejected this purported application of circuit law on the ground that the Board’s explanation of the standard was internally inconsistent: the first sentence requires a “critical difference,” yet the second states that a lesser showing would be sufficient. See International Ass’n of Machinists,
In the order on review, the Board reaffirmed the ALJ’s decision that the General Counsel’s reinstatement of the dismissed charges was improper. This time, the Board joined the ALJ in finding that there was no fraudulent concealment. Again purporting to apply this circuit’s precedents, the Board ruled that no finding of fraudulent concealment was possible without a showing of an affirmative act of concealment by Brown & Sharpe. See Brown & Sharpe Mfg. Co.,
II.
IAM petitions for review of the Board’s decision that there was no fraudulent concealment. The court will set aside the Board’s decisions when they are arbitrary or they otherwise err in applying established law to the facts. See Allegheny Ludlum
, In choosing a standard for determining what is necessary to show fraudulent concealment, and thus for application of the tolling exception to the Ducane rule, the Board chose to adopt this court’s precedent. Specifically, the Board adopted the three-pronged test established in Fitzgerald. Under that test, fraudulent concealment tolls a statute of limitations when (1) there has been “deliberate concealment” of (2) “material facts” relating to the alleged wrongdoing and (3) the wronged party does not know of those facts and could not have discovered them through “reasonable diligence.” Fitzgerald,
Although IAM contends that Brown & Sharpe deliberately misled the investigator into believing that the company had given full cooperation, IAM can identify no instances in which Brown & Sharpe affirmatively lied, nor do any such instances appear in the record. The crux of IAM’s argument is that merely by cooperating with the General Counsel’s investigation without divulging all of the information it knew to be relevant, Brown & Sharpe performed an affirmative act of concealment.
For these reasons, we conclude that the Board’s factual determination that there was no affirmative act of fraudulent concealment by the company is as unassailable as its legal determination that there had to be such an act to support reinstatement of the dismissed charges under the Ducane rule. At the same time, we acknowledge that fault for the delay in discovering the steering committee documents seems to lie not with the union, which had told the investigator about the existence of the steering committee, but with the General Counsel’s office. Its investigator could have asked the company for the steering committee documents, as both the Board and the ALJ noted. Yet it is the union that must bear the brunt of this failure, and of any unfair labor practice that the company may have committed but cannot be proven. However, as the court observed in reviewing the Board’s first order, the consequence of a statutory scheme that empowers only the General Counsel to issue complaints is that some party must bear the risk of negligence on the part of the General Counsel’s office: “Investigative foul-ups by the General Counsel necessarily burden one party or another (the charging party under Ducane, the charged party under its opposite); neither inequity is necessarily greater than the other, and it is within the Board’s discretion to strike the balance as it has.” District Lodge 64,
Notes
. In dissent, Chairman Gould took the position that no cooperation at all would be better than partial cooperation for the purposes of investigation. See Brown & Sharpe Mfg. Co.,
. Although IAM contends that under Hobson v. Wilson,
