Opinion for the Court filed by Senior Circuit Judge RANDOLPH.
This is a petition for review of a National Labor Relations Board order finding Fortuna Enterprises, L.P., in violation of § 8(a)(1) and (3) of the National Labor Relations Act, 29 U.S.C. § 158(a)(1) & (3). The Board cross-petitions for enforcement. Unite Here, Local 11, a labor union, has intervened. Fortuna operates the Los Angeles Airport Hilton Hotel and Towers. The case turns on whether Hilton disciplined its employees for engaging in activities protected by § 7 of the Act, id. § 157.
On May 10, 2006, Hilton suspended Sergio Reyes pending an investigation into whether he had stolen property from a hotel guest. Reyes supported an ongoing union organizing campaign at the Hilton led by Unite Here. When other employees learned of Reyes’ suspension, they decided to meet the next morning in the staff-only cafeteria to speak about the matter with Hilton’s general manager Grant Coonley or Tom Cook, the food and beverage director.
On the morning of May 11 at 8:00 a.m., seventy to one hundred employees gathered in the cafeteria. Hilton supervisors learned of the gathering and its purpose a short time later. Housekeeping director Anna Samayoa addressed the employees on three separate occasions between 8:15 and 9:00 a.m. The first time, she announced that they needed to return to work if they were not on break; the second time, that they needed to return to work or clock out and go home; and the third time, that individuals who failed to choose one of those options would be suspended. A handful of employees returned to work. The rest insisted on staying put until they met with Coonley or Cook. Supervisors suspended the holdouts at 9:00 a.m. and informed them that anyone who did not promptly leave the premises would be considered a trespasser. Undeterred, the suspended employees remained in the cafeteria and repeated their demand for a meeting.
The standoff persisted for roughly ninety more minutes, during which time the employees became increasingly frustrated with the lack of a management response. A delegation of employees told company officials that the group wanted to return to work. Management declined the offer, citing the suspensions. Out of options and faced with the arrival of a police officer, the employees left the cafeteria at approximately 10:30 a.m. All told, seventy-seven protesters were suspended for five days each, due to their “[i]nsubordination” and “[failure to follow instructions.”
The suspensions left Hilton shorthanded for the remainder of the day. Management called in temporary workers; even so, some of Hilton’s operations were adversely affected. For instance, Cook had to recruit staff from Hilton’s accounting and sales offices to bus tables in the guest café, which converted to buffet-style service due to the staff shortage. In addition, the housekeeping division was unable to clean all of the hotel’s guest rooms, which were 99.9% occupied at the time.
Three weeks later, on June 3, a second incident resulted in more disciplinary actions. On that date, a union — the California Teachers Association — held a meeting in the hotel’s international ballroom. The Association invited two of Hilton’s employees, Isabel Brentner and Patricia Sim *1299 mons, to speak to its members about the May 11 work stoppage. Brentner and Simmons did so during their lunch breaks. When management learned of this, it issued each of them a written warning for violating Hilton’s facilities use policy, which prohibits on-duty employees from entering the hotel’s public areas without authorization. Three other Hilton employees, Lilia Magallon, Juana Salinas, and Joanna Gomez, received similar warnings after management determined that they had also attended the meeting. Although these employees denied entering the ballroom, video footage taken by a nearby security camera showed each of them disappearing from view near its entrance for brief periods as they cleaned an adjacent lobby area.
The Board’s general counsel issued a complaint based on the May 11 suspensions, the June 3 warnings, and several other incidents. An Administrative Law Judge found the May 11 suspensions unlawful under § 8(a)(1) because the employees were engaged in concerted action for the “mutual aid or protection” of Reyes, their co-worker, and were thus protected by § 7 of the Act.
See
29 U.S.C. § 157. After considering the factors mentioned in
Quietflex Manufacturing Co.,
The Board affirmed the ALJ’s rulings, findings, and conclusions, subject to several minor modifications.
Fortuna Enters., L.P.,
355 N.L.R.B. No. 122,
I
Section 7 of the Act grants employees “the right to self-organization ... and to engage in other concerted activities for the purpose of ... mutual aid or protection. ...” 29 U.S.C. § 157. Section 8(a)(1) prohibits employers from “interfer[ing] with, restrain[ing], or coere[ing] employees in the exercise of’ those rights. 29 U.S.C. § 158(a)(1).
On-the-job work stoppages may qualify as concerted economic pressure entitled to protection under § 7.
Quietflex,
In
Quietflex
the Board offered a list of factors it had “considered” in previous cases “in determining which party’s rights should prevail in the context of an on-site work stoppage....”
Hilton asks us to set aside the order with respect to the May 11 suspensions on the ground that the Board’s assessment of nine of the ten
Quietflex
factors was flawed. This court must of course uphold the Board’s ruling so long as its legal determinations are not arbitrary or capricious and its factual findings are supported by substantial evidence.
E.I. du Pont de Nemours & Co.
*1301
v. NLRB,
As to the first
Quietflex
factor— why the employees stopped working — the Board determined that the employees occupied the cafeteria to express support for co-worker Sergio Reyes, and to ensure that Hilton would not unfairly target other union supporters for discipline. Hilton claims that the occupation was unprotected because it was intended only to seek information, and thus did not grow out of a bona fide labor dispute.
See Ne. Beverage Corp. v. NLRB,
With two exceptions, there is nothing to the balance of Hilton’s arguments against the Board’s application of the
Quietflex
■factors. The exceptions are the Board’s treatment of factor (3) — “whether the work stoppage interfered with production,” and factors (4) and (7) — “whether employees had adequate opportunity to present grievances to management” or access to “an established grievance procedure.”
Quietflex,
In mentioning interference with production,
Quietflex
dropped a footnote stating: “It is not considered an interference of production where the employees do no more than withhold their own services.”
Id.
at 1057 n. 6. We are not quite sure what to make of this. Suppose all fifty employees on an assembly line walked off the job. Or suppose only half of them walked off but this was enough to require shutting down the line. According to the Board’s footnote, in neither instance would there have been an interference with production — a conclusion at odds with reality. Furthermore, the point of this
Quietflex
factor is unclear. Some protected activities exert economic pressure on the employer
by interfering with production.
A strike is the prime example.
See Div. 1287 of the Amalgamated Ass’n of Street, Elec. Ry. & Motor Coach Emps. of Am. v. Missouri,
In any event, it does not appear that the interference-with-production factor played a significant role in the Board’s ruling against Hilton. The apparently decisive consideration related to Hilton’s handling of employee grievances.
See
The record does support the finding that Hilton officials suspended the employees without notifying them that a meeting with senior managers was not immediately possible or offering a future opportunity to meet. But those omissions are much less significant if Hilton employees had access to an established procedure for handling “group grievances.” The Board found that they did not. Hilton responds that it did have such a procedure in place, that it was widely known and often used, and that management therefore had no obligation to inform the employees in the cafeteria that it would hear and consider their concerns in the future. We agree.
Grievance procedures provide an orderly means for resolving employee concerns and thus promote the Act’s goal of achieving “industrial peace and stability.”
Auciello Iron Works, Inc. v. NLRB,
As we have said, the Board never quantified the weight to be given to any one of the Quietflex factors. In this case, we know only that the Board emphasized the absence of a group grievance procedure in its decision and that its finding to this effect was in error. We therefore grant the petition for review with respect to the Board’s assessment of the May 11 protest and remand this issue for reconsideration by the Board. 6
II
Section 8(a)(3) of the Act makes it an unfair labor practice for an employer to “discourage membership in any labor organization” by “discriminating] in regard to ... any term or condition of employment.” 29 U.S.C. § 158(a)(3). To prove a § 8(a)(3) violation, the Board must first demonstrate that anti-union animus motivated the employer to take an adverse employment action.
See Tasty Baking Co. v. NLRB,
There is no question that the warnings issued to Brentner, Simmons, Magallon, Salinas, and Gomez adversely affected the terms or conditions of their employment. It is also clear that, as Hilton stipulated, management knew each of the employees had engaged in union activities. Hilton claims, however, that there is no evidence that it knew the employees had engaged in protected activity on June 3 and that there is no evidence to show that their participation in the May 11 protest motivated the company to issue the warnings.
See
The record provides ample support for the Board’s finding. Sue Trobaugh, Hilton’s human resources director, testified that she knew about, but chose not to investigate, other violations of the facilities use policy. According to Trobaugh, maintenance staff complained that other employees were using public restrooms near the hotel lobby. This created extra cleanup work and contravened the facilities use policy, which required on-duty employees to use restrooms located in the hotel’s nonpublic areas. Although Trobaugh was aware of these violations, she decided that they were not “an investigative matter” and thus made no effort to pursue them. Hilton’s selective enforcement of the policy against Brentner, Simmons, Magallon, Salinas, and Gomez, but not against other, equally culpable employees, not only justifies the Board’s inference of anti-union animus, but also forecloses any argument that Hilton “would have taken the same action in the absence of the unlawful motive.”
Tasty Baking Co.,
For these reasons, we enforce the portion of the Board’s order finding that Hilton violated § 8(a)(1) and (3) 7 by issuing warnings to Brentner, Simmons, Ma-gallon, Salinas, and Gomez.
Ill
In addition to its rulings on the May 11 suspensions and the June 3 warnings, the Board also held that Hilton committed a number of other § 8(a)(1) violations.
See
The same is true of the Board’s rulings regarding threats made by managers Chriss Draper and Anna Samayoa towards union-affiliated employees. Hilton contends that the Board erred by “declining to rule” on these incidents, despite the ALJ’s conclusion that each gave rise to a § 8(a)(1) violation. Although some cases have suggested that § 10(c) of the Act requires the Board to resolve every charge that is presented to it,
see Oil, Chem. & Atomic Workers Local Union No. 6-118 v. NLRB,
For the foregoing reasons, the petition for review is granted in part and denied in part. The cross-petition for enforcement is likewise granted in part and denied in part. The case is remanded to the Board for further proceedings consistent with this opinion.
So ordered.
Notes
. This decision reinstated and incorporated by reference two earlier Board decisions, both of which were issued by a two-member Board.
See
354 N.L.R.B. No. 95,
. The
Quietflex
factors are: (1) the reason the employees have stopped working; (2) whether the work stoppage was peaceful; (3) whether the work stoppage interfered with production, or deprived the employer access to its property; (4) whether employees had adequate opportunity to present grievances to management; (5) whether employees were given any warning that they must leave the premises or face discharge; (6) the duration of the work stoppage; (7) whether employees were represented or had an established grievance procedure; (8) whether employees remained on the premises beyond their shift; (9) whether the employees attempted to seize the employer's property; and (10) the reason for which the employees were ultimately discharged.
. The
Northeast Beverage
employees were represented by a union actively bargaining on their behalf.
See
. The policy states:
Hilton Los Angeles Airport is proudly committed to maintaining an open door policy. Any discrimination or recrimination against a team member for presenting an issue, problem or complaint is prohibited.
A team member should always attempt to work out problems with his/her immediate supervisor. If the issue or problem remains unresolved, the team member can seek assistance from his/her department manager, the Director of Human Resources and the General Manager.
. This outcome also requires us to set aside and remand the Board’s separate ruling that Rogelio de la Rosa violated § 8(a)(1) when he threatened to suspend Fidel Andrade for participating in the May 11 work stoppage.
. Conduct that violates any of the more specific prohibitions of § 8, including § 8(a)(3), also interferes with employees’ § 7 rights and thus violates § 8(a)(1) derivatively.
See Metro. Edison Co. v. NLRB,
. For the sake of clarity, these findings are that Hilton managers unlawfully (1) interrogated employee Ricardo Molina; (2) threatened employees Antonio Campos and Beatrice Reyes; (3) barred various employees from wearing union insignia; (4) warned employee Nathalie Contreras for protesting customer harassment of other employees; and (5) pushed Campos away from co-workers who were engaged in protected activity.
