MURNAGHAN, Circuit Judge:
Cases are sometimes not as simple as they seem. So it is here. The General Counsel for the National Labor Relations Board lodged an unfair labor practice charge against the employer, McLean Trucking Company, alleging that an employee, Carl D. Daniels, was discharged as a consequence of McLean’s anti-union bias in violation of §§ 8(a)(1) and 8(a)(3) of the National Labor Relations Act, 29 U.S.C. §§ 158(a)(1) and 158(a)(3). The matter is here on McLean’s petition for review and the Board’s cross-petition for enforcement of a cease-and-desist order issued against McLean.
I.
It is helpful to sketch the background of the legal landscape before painting in the factual details. As is frequently the case where a discriminatory discharge is alleged, the central and difficult issue is one of fact — the motive of the employer. If anti-union animus, a discriminatory motive, was “a factor” in the employer’s decision to discharge the employee, the unfair labor practice is established. NLRB v. Kiawah Island Co., 650 F.2d 485, 490 (4th Cir.1981); American Thread Co. v. NLRB, 631 F.2d 316, 320 (4th Cir.1980); Neptune Water Meter Co. v. NLRB, 551 F.2d 568, 569 (4th Cir.1977); NLRB v. Consolidated Diesel Electric Co., 469 F.2d 1016, 1024 (4th Cir. 1972). Because the issue is one of fact, our scope of review is limited. We must see whether substantial evidence on the record as a whole supports the determination of the Board. E.g., Jeffrey Manufacturing Division v. NLRB, 654 F.2d 944, 948 (4th Cir.1981).
As countless judicial opinions reveal, the hard cases are those that feature evidence of both improper and good motivation— the so-called “dual motive” scenario. In such circumstances, the employer typically contends that, even though it was far from pleased by an employee’s protected activities, the discharge nevertheless was motivated solely by and predicated exclusively upon legitimate management concerns. Where the case assumes that posture, we require that “the evidence must demonstrate why the good motive was not the sole reason for the discharge.” Kiawah Island, supra, at 491. The Board must articulate, with support in the record, “an affirmative and persuasive reason why the employer rejected the good cause and chose a bad one.” Firestone Tire & Rubber Co. v. NLRB, 539 F.2d 1335, 1337 (4th Cir.1976). If “an affirmative and persuasive reason” is shown, then it fairly can be said that anti-union animus was “a factor” in the discharge. If “an affirmative and persuasive reason” is not articulated and supported, our unbroken practice has been to decline enforcement because, as a [1228]*1228reviewing court, we are unable to determine whether the Board has in fact given due consideration to the record as a whole. In such circumstances, the Board’s decision is, in essence, a declaration that “the discharge was ‘pretextual.’ . .. [That is] ‘all too easy to say.’ ” Firestone Tire, supra, at 1337.1
II.
Making the case seem, at first blush, rather simple is the fact that there is substantial evidence in the record to support the Board’s initial conclusion that McLean harbored an anti-union animus with regard to Daniels. Daniels, who was fired on October 9, 1979, actively and zealously engaged in a number of activities protected under the federal labor laws. In particular, Daniels assisted fellow employees in presenting grievances against McLean,2 filed an even greater number of grievance claims against the company on his own behalf,3 and, additionally, took an active role in organizational matters.4 Of course, mere membership in a union, or the mere exercise of rights protected under the National Labor Relations Act, does not immunize an employee from discharge. E.g., NLRB v. Appletree Chevrolet, Inc., 608 F.2d 988, 994 n. 5 (4th Cir.1979). As the evidence adduced below shows, however, Daniels’ protected acts earned him the ire of McLean officials, and those officials in fact expressed their interests in “getting rid” of Daniels because of his persistent protected conduct.5 Indeed, [1229]*1229the evidence of unambiguous anti-union observations made with respect to Daniels justified a conclusion that there was anti-union animus and that it contributed to the attitudes of the employer toward the employee. McLean readily agrees to that much. The company conceded at oral argument that the General Counsel, on the basis of that evidence, made out a prima facie case of discriminatory discharge. Were that the entire matter, a simple affirmance of the Board’s order to cease and desist directed against McLean would be our course.
There is additional evidence, though, making the case rather more complicated. McLean contends that, despite whatever anti-union animus it may have held toward Daniels, there was an independent good cause for discharging Daniels which in fact was the cause of the discharge. And to support its position, McLean points to a substantial body of evidence that demonstrates that Daniels was an unsatisfactory, or, to use the word employed by the administrative law judge, a “horrendous” employee. Beyond any real dispute here is the fact that Daniels was tardy or unexcusedly absent 31 percent of the time over a 36-month period,6 and had accumulated a large array of reprimands and warnings.7 Indeed, the ALJ, after taking note of that work record, candidly observed that the only viable conclusion would be that Daniels was discharged because he was a poor employee, and not because he was active in union and labor affairs.8 Were that all there was to the matter, we would be compelled to swing to the other extreme and conclude that a refusal to enforce the Board’s cease-and-desist order would be called for.
But, there is more — a third level of evidence and administrative action further [1230]*1230complicating the case. The collective bargaining agreement between McLean and the exclusive representative of its employees provides that a warning notice issued against an employee “shall not remain in effect for more than nine (9) months.” The ALJ reasonably understood that language as a contractual bar against a discharge based upon stale wrongdoing, stale being anything more than nine months old.
As one might almost guess having read so far, the vast bulk of Daniels’ wrongdoings were of the stale variety.
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MURNAGHAN, Circuit Judge:
Cases are sometimes not as simple as they seem. So it is here. The General Counsel for the National Labor Relations Board lodged an unfair labor practice charge against the employer, McLean Trucking Company, alleging that an employee, Carl D. Daniels, was discharged as a consequence of McLean’s anti-union bias in violation of §§ 8(a)(1) and 8(a)(3) of the National Labor Relations Act, 29 U.S.C. §§ 158(a)(1) and 158(a)(3). The matter is here on McLean’s petition for review and the Board’s cross-petition for enforcement of a cease-and-desist order issued against McLean.
I.
It is helpful to sketch the background of the legal landscape before painting in the factual details. As is frequently the case where a discriminatory discharge is alleged, the central and difficult issue is one of fact — the motive of the employer. If anti-union animus, a discriminatory motive, was “a factor” in the employer’s decision to discharge the employee, the unfair labor practice is established. NLRB v. Kiawah Island Co., 650 F.2d 485, 490 (4th Cir.1981); American Thread Co. v. NLRB, 631 F.2d 316, 320 (4th Cir.1980); Neptune Water Meter Co. v. NLRB, 551 F.2d 568, 569 (4th Cir.1977); NLRB v. Consolidated Diesel Electric Co., 469 F.2d 1016, 1024 (4th Cir. 1972). Because the issue is one of fact, our scope of review is limited. We must see whether substantial evidence on the record as a whole supports the determination of the Board. E.g., Jeffrey Manufacturing Division v. NLRB, 654 F.2d 944, 948 (4th Cir.1981).
As countless judicial opinions reveal, the hard cases are those that feature evidence of both improper and good motivation— the so-called “dual motive” scenario. In such circumstances, the employer typically contends that, even though it was far from pleased by an employee’s protected activities, the discharge nevertheless was motivated solely by and predicated exclusively upon legitimate management concerns. Where the case assumes that posture, we require that “the evidence must demonstrate why the good motive was not the sole reason for the discharge.” Kiawah Island, supra, at 491. The Board must articulate, with support in the record, “an affirmative and persuasive reason why the employer rejected the good cause and chose a bad one.” Firestone Tire & Rubber Co. v. NLRB, 539 F.2d 1335, 1337 (4th Cir.1976). If “an affirmative and persuasive reason” is shown, then it fairly can be said that anti-union animus was “a factor” in the discharge. If “an affirmative and persuasive reason” is not articulated and supported, our unbroken practice has been to decline enforcement because, as a [1228]*1228reviewing court, we are unable to determine whether the Board has in fact given due consideration to the record as a whole. In such circumstances, the Board’s decision is, in essence, a declaration that “the discharge was ‘pretextual.’ . .. [That is] ‘all too easy to say.’ ” Firestone Tire, supra, at 1337.1
II.
Making the case seem, at first blush, rather simple is the fact that there is substantial evidence in the record to support the Board’s initial conclusion that McLean harbored an anti-union animus with regard to Daniels. Daniels, who was fired on October 9, 1979, actively and zealously engaged in a number of activities protected under the federal labor laws. In particular, Daniels assisted fellow employees in presenting grievances against McLean,2 filed an even greater number of grievance claims against the company on his own behalf,3 and, additionally, took an active role in organizational matters.4 Of course, mere membership in a union, or the mere exercise of rights protected under the National Labor Relations Act, does not immunize an employee from discharge. E.g., NLRB v. Appletree Chevrolet, Inc., 608 F.2d 988, 994 n. 5 (4th Cir.1979). As the evidence adduced below shows, however, Daniels’ protected acts earned him the ire of McLean officials, and those officials in fact expressed their interests in “getting rid” of Daniels because of his persistent protected conduct.5 Indeed, [1229]*1229the evidence of unambiguous anti-union observations made with respect to Daniels justified a conclusion that there was anti-union animus and that it contributed to the attitudes of the employer toward the employee. McLean readily agrees to that much. The company conceded at oral argument that the General Counsel, on the basis of that evidence, made out a prima facie case of discriminatory discharge. Were that the entire matter, a simple affirmance of the Board’s order to cease and desist directed against McLean would be our course.
There is additional evidence, though, making the case rather more complicated. McLean contends that, despite whatever anti-union animus it may have held toward Daniels, there was an independent good cause for discharging Daniels which in fact was the cause of the discharge. And to support its position, McLean points to a substantial body of evidence that demonstrates that Daniels was an unsatisfactory, or, to use the word employed by the administrative law judge, a “horrendous” employee. Beyond any real dispute here is the fact that Daniels was tardy or unexcusedly absent 31 percent of the time over a 36-month period,6 and had accumulated a large array of reprimands and warnings.7 Indeed, the ALJ, after taking note of that work record, candidly observed that the only viable conclusion would be that Daniels was discharged because he was a poor employee, and not because he was active in union and labor affairs.8 Were that all there was to the matter, we would be compelled to swing to the other extreme and conclude that a refusal to enforce the Board’s cease-and-desist order would be called for.
But, there is more — a third level of evidence and administrative action further [1230]*1230complicating the case. The collective bargaining agreement between McLean and the exclusive representative of its employees provides that a warning notice issued against an employee “shall not remain in effect for more than nine (9) months.” The ALJ reasonably understood that language as a contractual bar against a discharge based upon stale wrongdoing, stale being anything more than nine months old.
As one might almost guess having read so far, the vast bulk of Daniels’ wrongdoings were of the stale variety. What is more, his recent write-ups — those occurring during the nine-month period immediately preceding his discharge — were four in number and each and every one of a wholly trivial nature. Two raised productivity complaints, but, because McLean had no productivity standards, the two complaints did not figure in the company’s deliberations leading to the discharge. The two grounds actually considered involved Daniels’ use of automobiles. One, simply put, was a parking violation. The second charged use of an automobile in an unauthorized area. During a rainstorm, Daniels either drove a car upon, or was a passenger in a car which entered, the loading area at McLean’s worksite. His goal was to avoid getting wet while he dropped in to pick up his weekly pay. As the ALJ concluded, and as we agree, the two automobile incidents would not, in and of themselves, warrant the dismissal of the typical McLean employee.
With the language of the collective bargaining agreement before him, the ALJ determined that he was completely interdicted from regarding the entire work record of Daniels in resolving the unfair labor practice charge. The ALJ took the position that he was permitted only to consider those matters in Daniels’ file concerning his performance during the nine months preceding the discharge. Working from that premise, the ALJ deduced that there really was no good cause in support of the dismissal and that, consequently, the real reason must have been McLean’s anti-union sentiments.
III.
The ALJ operated from a faulty premise. It was error to accord no weight whatsoever to the host of performance deficiencies Daniels exhibited prior to the nine-month period that preceded his discharge merely because the collective bargaining agreement directed McLean not to consider them.
The crucial question before the ALJ was one of McLean’s actual motive. We may assume that McLean might stand in breach of the labor contract for considering and acting upon Daniels’ stale warning notices, but it remains entirely probable that McLean in fact considered and acted upon those grounds, and on those grounds alone. In that case, anti-union animus did not motivate McLean. Its sole motive would have been to rid itself of a demonstrably poor worker. However wrongful, in the world of contract law, a discharge for those reasons might be,9 the discharge would not implicate § 8(a)(1) and § 8(a)(3) of the National Labor Relations Act because an anti-union animus would not have been “a factor” in McLean’s decision.10
To have ruled out that probability, and to have given the evidence of Daniels’ poor [1231]*1231overall performance no further consideration, solely on the basis of the labor contract’s terms, was error, as the General Counsel forthrightly conceded at oral argument.
IV.
The contention nevertheless is made that the court’s mission is to review decisions reached by the Board, and not those made by an administrative law judge. And it is submitted by the General Counsel that the Board did in fact give consideration to Daniels’ entire work record. The Board’s observations in that respect were as follows:
In the instant proceeding, Respondent [McLean] contends that Daniels was discharged for 6 years of misconduct. These defenses are clearly afterthoughts. Such shifting of defenses indicates that Daniels was discharged unlawfully.
As we see it, there is a difficulty of some magnitude in the approach taken by the Board. It appears verbally to avoid but, in fact, to repeat the error of the ALJ.11
Of course, what the Board did was to invoke the familiar proposition that an employer’s recitation of different justifications to support a discharge at different points in time can, in certain circumstances, constitute “an affirmative and persuasive reason” for concluding that the asserted justifications never truly figured into the employer’s actual decision to discharge the employee. E.g., Jeffrey Manufacturing, supra, at 948. See also Taft Broadcasting Co., 238 N.L.R.B. 588 (1978). With that proposition in hand, the Board swept entirely aside, as did the ALJ for a different reason, Daniels’ stale performance deficiencies and accorded them no further consideration.
Legal propositions in their abstract guise, however, should not be cited and applied indiscriminately because, not infrequently, they fail to take into account facts rendering the legalisms inapposite. The Board committed such an indiscretion when it branded McLean’s resort to Daniels’ overall work record a “shifting of defenses.”
At the risk of overemphasis the question to be resolved is one of historical fact — the motivation of McLean at a certain fixed point in time. Where such an inquiry must be made, there is always the risk that it may be obstructed by post hoc rationalizations offered by an employer to clothe a discriminatory discharge in legitimacy. That is where the “shifting of defenses” proposition comes into play. On occasion, an employer’s resort to several different justifications which change over time — the employer’s inability to settle upon a coherent declaration of its motive, an historical fact only known to itself — is evidence from which a factfinder might infer that an established anti-union bias probably prevailed in the employer’s mind. Unable to offer a consistent and coherent “good motive”, the employer cannot complain if its vacillating defenses are rejected as inherently suspect. See Jeffrey Manufacturing, supra; Taft Broadcasting, supra.
No such inconsistency or vacillation renders McLean’s position inherently suspect here, and therein lies the Board’s error. To be sure, McLean did not verbally point to Daniels’ long and storied work history when it first sought to discharge him. At the discharge hearing, where collective bargaining agreement considerations were paramount, the company limited its case, at least formally, to the automobile violations. As soon as the matter came under the auspices of the National Labor Relations Act, however, McLean stood resolute in its expression of the position that Daniels was fired because of his established poor performance. Whatever change in position McLean exhibited between the discharge hearing and the proceedings before the ALJ and the Board stands revealed as owing to the recognition that poor performance more [1232]*1232than nine months old would be irrelevant in the discharge hearing but, properly viewed, quite cogent before the NLRB. It was a case of “coming clean” by McLean before the NLRB, to judge from the evidence we have before us, and not, as the Board concluded, the manufacturing of after-the-fact rationalizations. In short, it seems McLean might indeed have been motivated by Daniels’ entire work record, but refrained from announcing that fact initially for fear of a consequent adverse conclusion in a subsequent contract grievance proceeding. Consistent with that view of the possibilities, an incentive to reveal the truth first arose once the prospect of an unfair labor practice charge ripened into a reality. We cannot overlook, in that vein, the fact that by time the unfair labor practice proceeding here developed, McLean had prevailed in a grievance proceeding brought by Daniels.12 The point should not be overlooked that McLean’s two positions were not mutually inconsistent. McLean could, mistakenly it turns out, but perfectly reasonably, rely on the recent deficiencies where it was contractually bound to do so, yet contend additionally (not contradictorily) that the peccadilloes more remote in time justified the discharge when the contract did not stand in the way.
The Board, then, committed in substance if not in form the same error committed by the ALJ. It failed to confront and grapple with a substantial body of evidence that tends to show that Daniels’ discharge was not the product of a discriminatory motive. It summarily, for an inadequate reason, read out of the case evidence quite probative in nature.
We do not question the determination reached by both the Board and the ALJ that Daniels’ most recent misbehavior — the automobile violations which occurred in the nine-month period immediately preceding the discharge — was wholly insufficient to justify the discharge. That misbehavior was a pretext masking some other, true, factor. The question left inadequately addressed by both the Board and the ALJ, however, is what that other factor was. It could have been McLean’s anti-union animus. But at least as likely, as the evidence now stands, it was McLean’s decided intention to rid itself of a demonstrably poor worker at the earliest opportunity. While the recent misbehavior, viewed in isolation, may have been trivial, it could have been the straw that broke the camel’s back.
V.
Absent from the record, by virtue of both the ALJ’s and the Board’s failure to consider, with appropriate weight attached, the full extent of Daniels’ work record, is the articulation of “an affirmative and persuasive reason why the employer rejected the good cause and chose a bad one.” Firestone Tire, supra, at 1337. Lacking is a supportable reason for the Board’s conclusion that anti-union animus, rather than McLean’s utter disenchantment with Daniels as a worker, prompted the discharge.
The General Counsel, accordingly, has failed, on the record before us, to carry the burden of proof.13 We thus decline to enforce, but do so without prejudice to any determination by the NLRB to further pursue the unfair labor practice charge and to resolve, on an adequate basis, the decisive question of motive.
The Board’s stated reason for rejecting McLean’s asserted good cause was “all too easy to say.” Firestone Tire, supra, at 1337. Without analysis of the subtléties presented by the case and without resort to a cogent reason derived from its expertise in labor-management relations, the Board simply incanted a legal aphorism — the “shifting of defenses” principle — that plainly has no bearing on the case at hand.
Perhaps on remand the Board will better articulate its rationale, finding reasons rooted in evidence or in its knowledge of labor relations and employer practices that would explain persuasively why McLean’s asserted cause — which the ALJ accepted as proven, yet dismissed as [1233]*1233irrelevant14 — should be disbelieved. Until the Board takes that step, however, we are obliged to deny enforcement. It is the Board’s task to weigh conflicting relevant evidence, to apply its expertise, and to assign reasons for its decision. Our task is to review the decision of the Board in light of what it did and the grounds it has asserted in support of its decision, not in light of those things the Board might have done but did not do or those grounds the Board might have asserted but did not assert. E.g., Texas Gas Transmission Corp. v. Shell Oil Co., 363 U.S. 263, 270, 80 S.Ct. 1122, 1127, 4 L.Ed.2d 1208 (1960); Securities and Exchange Commission v. Chenery Corp., 318 U.S. 80, 87, 63 S.Ct. 454, 459, 87 L.Ed. 626 (1943). We thus are not free to grant enforcement of the Board’s order on the ground advanced by the dissenting opinion — that the Board reached a fair factual determination in the face of competing evidence. That is so because the Board, in fact, never did weigh the competing evidence. Instead, it effectively excluded from consideration, for a reason shown to be incorrect, relevant evidence supportive of the employer’s position that the discharge was prompted by a lawful motive.
Because the Board has advanced no affirmative and persuasive reason in support of its action, we are constrained to deny enforcement.
ENFORCEMENT DENIED AND CAUSE REMANDED.