Opinion for the Court filed by Circuit Judge SENTELLE.
Concurring opinion filed by Circuit Judge ROGERS.
SENTELLE, Circuit Judge:Drug Plastics & Glass Company (“Drug Plastics”) petitions for review of an order of the National Labor Relations Board (“NLRB” or the “Board”) remedying unfair labor practices under Section 8(a)(1) of the National Labor Relations Act (“NLRA”), 29 U.S.C. § 158(a)(1) (1988), and the NLRB cross-petitions for enforcement of the order. Drug Plastics contends that the complaint which gave rise to the order exceeded the scope of the allegations in the union’s charge, and thus the allegations in the complaint were untimely under NLRA § 10(b), 29 U.S.C. § 160(b). We previously denied Drug Plastics’ petition for review and allowed the cross-petition for enforcement. Drug Plastics & Glass Co. v. NLRB, 30 F.3d 169 (D.C.Cir.1994). Upon rehearing, we have come to the conclusion that Drug Plasties is correct in its position that the allegations in the complaint did not bear a “significant factual relationship” to the single allegation in the charge. We therefore grant Drug Plastics’ petition for review and deny enforcement of the Board’s order.
I. BACKGROUND
Drug Plastics, a Pennsylvania manufacturer of plastic bottles for pharmaceutical use, discharged employee Allen Matthews in April, 1991, after a company vice-president learned that Matthews had been smoking on the production floor in violation of company policy and that he had failed to attend certain quality control meetings. Prior to Matthews’ discharge, in January and February, 1991, petitioner had been the subject of modest, ultimately unsuccessful union organizing activities by the United Rubber, Cork, Linoleum and Plastic Workers of America, District No. 1 (the “Union”), in which the Union failed to convince a single Drug Plastics employee to sign an authorization card.
On July 15, 1991, the Union filed with the NLRB an unfair labor practice charge, alleging the following violation of NLRA §§ 8(a)(1) and 8(a)(3):1
The above-named employer unjustly terminated Allen Rich Matthews because of his union activities and support of the Union effort in the above named plant. Allen Rich Matthews was discharged on or around April 26, 1991.
No other allegations were included in the charge.
*1019Following the Union’s filing, the NLRB General Counsel conducted an investigation. On September SO, 1991, the General Counsel issued a complaint, alleging violations of §§ 8(a)(1) and 8(a)(3) arising from Matthews’ discharge, and violations of § 8(a)(1) arising from conduct by the company during the union organizing campaign. Specifically, the complaint alleged that (1) in February, 1991, Drug Plastics’ Vice President Glenn Forte solicited employees’ grievances, thereby promising improved conditions of employment in order to discourage Union support, and created the impression that Union activities were under surveillance; (2) in February, 1991, Assistant Vice President John Rogers threatened employees with unspecified reprisals if they signed Union authorization cards; (3) in February, 1991, Tim Matthews, a supervisor at the plant, threatened two employees with plant closure if thé employees unionized; (4) in early April, 1991, Drug Plastics’ President Fred Beisicker also threatened employees with plant closure if they unionized; (5) in June, 1991, Bill Mellen, another plant supervisor, threatened to discharge an employee if the employee engaged in union activity and told an employee that the Union’s organizing activities were being monitored; (6) in April, 1991, the company instituted a wage increase in order to discourage unionization; and (7) in April, 1991, the company discharged Allen Matthews because of his union activities, as alleged in the original charge.
In March, 1992, the NLRB conducted a hearing before a Board Administrative Law Judge (“ALJ”) in Philadelphia, Pennsylvania. Drug Plastics defended its dismissal of Matthews on the grounds that Matthews broke company policy when he smoked on the production floor, failed to attend a “pre-control” meeting required of employees, and exhibited excessive absenteeism during the first three months of 1991. With respect to the separate § 8(a)(1) allegations in the complaint, Drug Plastics entered a general denial and moved for dismissal, arguing that the allegations were timé-barred by NLRA § 10(b), which provides:
Whenever it is charged that any person has engaged in or is engaging in any such unfair labor practice, the Board ... shall have power to issue and cause to be served upon such person a complaint stating the charges in that respect.... Provided, 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 and service of a copy thereof....
29 U.S.C. § 160(b). Drug Plastics contended that the Board lacked jurisdiction to act upon the alleged anti-union activities by the company that had occurred in February, 1991. Consequently, Drug Plastics presented no evidence with respect to those allegations.
After the hearing, the NLRB ALJ rejected Drug Plasties’ time-bar defense, concluding that the allegations in the complaint bore a sufficiently close relationship to those in the charge to satisfy the timeliness requirements of § 10(b). He found, however, that Allen Matthews had not been active in any Union organizing campaign and that the company discharged him for good cause, thus dismissing the unlawful discharge allegation which formed the basis for the Union charge. With respect to the other allegations, the ALJ concluded that Drug Plastics violated § 8(a)(1) in the plant closure threats by Tim Matthews and Fred Beisicker, the discharge threat by Bill Mellen, and the solicitation of grievances and threats of surveillance by Glenn Forte. All of the remaining allegations were dismissed. Drug Plastics filed exceptions to the ALJ’s decision with the NLRB. The NLRB affirmed the ALJ’s decision in full. Drug Plastics petitioned this court for review of these decisions under 29 U.S.C. § 160(f), and the Board cross-applied for enforcement. In our original opinion, we granted enforcement to the Board, concluding that it had alleged a sufficient factual nexus between the complaint allegations and the charge allegation. Drug Plastics & Glass Co. v. NLRB, 30 F.3d 169 (D.C.Cir.1994) (“Drug Plastics I”). Drug Plastics petitioned for rehearing, and we granted the petition.
II. DISCUSSION
Drug Plastics’ argument is straightforward. Under 29 U.S.C. § 160(b), the Board *1020may not issue a complaint alleging an unfair labor practice except upon a properly filed charge alleging that such practice occurred within six months prior to the filing and service of the charge. Of the numerous allegations in the complaint against Drug Plastics, only the allegation concerning Allen Matthews met that criteria. Therefore, petitioner argues, the Board had no jurisdiction to pass on the other allegations. The Board does not dispute the basic law as stated by the petitioner but responds that it and the General Counsel, who acts for the Board in the investigation of charges and prosecution of complaints, may investigate and complain beyond the actual events in the charge “in order properly to discharge the duty of protecting public rights which Congress has imposed upon it.” NLRB v. Fant Milling Co., 360 U.S. 301, 308, 79 S.Ct. 1179, 1183-84, 3 L.Ed.2d 1243 (1959). That is, it must be “free to make full inquiry under its broad investigatory power.” Id.
But Fant Milling does not give the Board “carte blanche to expand the charge as [it] might please, or to ignore it altogether.” Id. at 309, 79 S.Ct. at 1184. The Supreme Court in Fant Milling expressly “h[e]ld only that the Board is not precluded from ‘dealing adequately with unfair labor practices which are related to those alleged in the charge and which grow.out of them while the proceeding is pending before the Board.’ ” Id. (emphasis added) (quoting National Licorice Co. v. NLRB, 309 U.S. 350, 369, 60 S.Ct. 569, 579, 84 L.Ed. 799 (1940)). Thus, as we noted in G.W. Galloway Co. v. NLRB, 856 F.2d 275 (D.C.Cir.1988), “[W]hen the Board ventures outside the strict confines of the charge, it must limit itself to matters sharing a significant factual affiliation with the activity alleged in the charge.” Id. at 280 (emphasis added).
The Galloway case is strikingly parallel to the present facts. In that ease, as in this one, the unfair labor practice charge alleged the improper firing of a specific employee for protected union activity. The Board’s complaint added allegations concerning general anti-union activity by the same employer against its employees at the same plant. Id. at 277. In that case, the claim of relatedness was stronger than this one, as the questionable allegations concerned events only one day earlier than the firing alleged in the charge, but we specifically held:
It cannot be that allegations in a charge and a complaint having no more in common than that they concern the same employer and occur at the same location are sufficiently related to satisfy Section 10(b).
Galloway, 856 F.2d at 280.
Nothing offered by the Board in its opinion or even in its defense before this court establishes the “significant factual relation” required by Galloway. See Galloway, 856 F.2d at 280. In fact, the only relationship found by the Board was that all of the events underlying the allegations were in response to the same “anti-union campaign,” and that Matthews had been subjected to some of the alleged discriminatory statements. Drug Plastics & Glass Co., 309 NLRB 1306, 1306 n. 2 (1992). The General Counsel’s complaint, however, makes no mention whatsoever of Matthews, except in the single allegation from the charge. At our first hearing, when it was pointed out to the Board that the evidence did not support the allegation of that single count, the Board urged, and we agreed, that we should view the relatedness of the charge and the complaint at the time of the allegations. On this one point, the original panel was unanimous. See Drug Plastics I, 30 F.3d at 172, 177. Both the majority and the dissent quoted with approval from the dissent of then-judge Stevens in NLRB v. Braswell Motor Freight Lines, Inc., 486 F.2d 743 (7th Cir.1973), that “I would suppose the Board’s jurisdiction should be tested by the General Counsel’s allegations rather than his proof.” The difficulty for the Board in this case is that this viewing as of the time of the allegations reveals no factual relatedness between the allegation in the charge and the additional allegations in the complaint. The Board alleged none. We stand by our holding in the original opinion in this case that the relatedness is determined as of the time of allegation.
As in Galloway, then, the only real factual connection between the charge allegations and the complaint allegations is that *1021they occurred "during the same time period." Galloway found such a mere chronological relationship to be insufficient to support a "significant factual affiliation." 856 F.2d at 281. Thus, under our reasoning in Galloway, the Board has not alleged adequate relatedness.
The Board applied our Galloway reasoning in Nickels Bakery of Indiana, Inc., 296 NLRB 927, 928 (1989), adopting a three-part test for whether complaint allegations are "closely related" to charge allegations. Under Nickels Bakery, the Board looks to whether a complaint allegation (1) involves the same~ legal theory as the charge allegation, (2) arises from the same factual circumstances or sequence of events as the charge allegation, and (3) raises similar defenses as the charge allegation. Id. Pursuant to Chevron U.S.A. Inc. v. Natural Resources Defense Council, Inc., 467 U.S. 837, 842, 104 S.Ct. 2778, 2781, 81 L.Ed.2d 694 (1984), we defer to this test as a permissible interpretation of § 10(b). See Lotus Suites, Inc. v. NLRB, 32 F.3d 588, 591 (D.C.Cir.1994). But deferring to the test does not mean that we must affirm the Board in this case. Nickels Bakery does not support the Board's conclusion, and Galloway dictates its reversal.
The only justifications offered in the decision of the administrative law judge adopted by the Board for the relatedness of the allegations in the complaint and the single allegation in the charge is that they "arise out of the same alleged anti-union campaign," and that they both bear on anti-union animus. Drug Plastics & Glass Co., 1992 WL 394663, at *5, 1992 NLRB LEXIS 644, at *9• The Board cannot employ this basis as "adequate relatedness" consistent with its decision in Nippondenso Mfg. U.S.A., Inc., 299 NLRB 545 (1990); thus, the Board's action here is an unexplained deviation from its own precedent.
In Nippondenso, the only charge on file when the complaint issued alleged that "{o]n or about 4/26/88, the Company discharged an employee" in violation of section 8(a)(3); that "[o}n 2/25/88 the Company was notified, by letter, [the employee] was a member of the In-Plant Organizing Committee;" and that the employer violated section 8(a)(1) "[b]y the above and other acts. . . ." id. at 545. The complaint alleged several violations of section 8(a)(1) that were not mentioned in the charge, including that (1) a supervisor enforced a rule prohibiting the wearing of buttons other than those issued by the employer, (2) supervisors engaged in disparate treatment of union activity by enforcing a rule prohibiting the posting of literature and then applying the rule disparately to union literature, and (3) supervisors promulgated and enforced other bans on the wearing of union paraphernalia and displaying union insignias. Id. The Board analyzed the relatedness of the charge to the complaint under its Nickels Bakery three-part framework, and concluded that the General Counsel "ha[d] not established a factual nexus between the allegations in the charge ... and those set forth in the complaint," apart from "their relationship to the same organizing campaign. . . ." Id. at 545, 546. Although the General Counsel contended that the allegations were sufficiently linked because they all alleged discriminatory acts against employees "during, and in order to quell, a union campaign," id. at 545, the Board concluded that it could not justify "finding the allegations closely related based on legal theory alone." Id.
In the instant case, the Board found that the complaint allegations were "closely related" to the charge allegation because it found that the allegations "arose out of the Respondent's overall plan to resist the Union .; that all the allegations occurred after the respondent's acknowledged awareness of the organizing effort ...; that several of the allegations involved statements to employee. Matthews ...; and that the 8(a)(1) allegations generally occurred during the same time period at the 8(a)(3) allegation." Drug Plastics & Glass Co., 309 NLRB 1306, 1306 n. 2 (1992). The Board's justification here is no more than a restatement of the one it held inadequate in Nippondenso. The only connection left between the charge and complaint is "legal theory," and even then only in the broadest sense, that of "anti-union animus." Nippon4enso makes clear, though, that allegations which are related by mere legal theory are not "closely related" for *1022purposes of § 10(b), 299 NLRB at 545-46, and the Board has not since overruled that opinion. In order to diverge from agency-precedent, the Board must “supplfy] a reasoned analysis indicating that prior policies and standards are being deliberately changed, not casually ignored.” Cross-Sound, Ferry Services, Inc. v. Interstate Commerce Comm’n, 934 F.2d 327, 329 (D.C.Cir.1991) (citations omitted). The Board provides no explanation for its departure from Nippondenso, and we are unable to discern one; consequently, we conclude that the Board’s order is contrary to its own precedent.
We find further support for this conclusion in our recent opinion in Lotus Suites, Inc. v. NLRB, 32 F.3d 588 (D.C.Cir.1994). In Lotus Suites, we held that general boilerplate allegations in a union charge which contained no particular facts could not support specific complaint allegations because the charge allegations were “utterly lacking in factual specificity.” Id. at 592. Because the charge allegations were general in nature, there could be no “sufficient factual connection” between the charge and the complaint. Id. Lotus Suites illustrates the importance of alleging a factual relationship between the charge allegations and the complaint allegations, which the Board failed to do here. Where the Board is unable to connect the allegations in its complaint with the charge allegation, we are unable to find that the Board has jurisdiction over the unrelated complaint allegations.
Because we find that the Board did not have proper jurisdiction over the allegations which supported its finding of § 8(a)(1) violations by Drug Plastics, and because the six-month limitations period of § 10(b) has since elapsed, the order of the Board is vacated, and its enforcement is denied.
. NLRA § 8(a) provides, in relevant part:
(a) It shall be an unfair labor practice for the employer—
(1) to interfere with, restrain, or coerce employees in the exercise of- the rights guaranteed in section 157 of this title [NLRA Section 7, 29 U.S.C. § 157]; ...
(3) by discrimination in regard to hire or tenure of employment or any term or condition of employment to encourage or discourage membership in any labor organization....
29 U.S.C. § 158(a) (1988).