POSNER, Circuit Judge.
The Board asks us to enforce its order finding that the respondent, BFI, committed an unfair labor practice by terminating two workers who refused to cross a picket line at a customer’s premises. BFI is in the business of hauling chemical wastes. It employs six truck drivers, driving six trucks, to pick up the wastes from storage tanks on its customers’ premises and haul them to disposal sites. One of its major customers is an International Harvester plant, whose employees were lawfully on strike, and picketing the plant, between November 1979 and April 1980. On February 19, 1980, International Harvester placed an order that would have required all six of BFI’s trucks to fill. Two of the drivers said they would not cross the picket line, and BFI told them they would be permanently replaced. The next day, before permanent replacements had actually been hired, International Harvester reduced its order to two truckloads, but BFI went ahead and hired permanent replacements.
The first question we consider, one of first impression in this circuit, is whether a refusal to cross a picket line at the premises of an employer’s customer rather than of the employer himself is protected activity under section 7 of the National Labor Relations Act, 29 U.S.C. § 157, which gives workers the right “to form, join or assist labor organizations, to bargain collectively through representatives of their own choosing, and to engage in other concerted activities for the purpose of their mutual aid or protection ... . ” If it is not protected activity then BFI, which is accused only of violating section 8(a)(1) of the Act, 29 U.S.C. § 158(a)(1) (interference with protected activity), cannot be guilty of an unfair labor practice in getting rid of the balking drivers.
The Board does not suggest that the refusal to cross the picket line was concerted action between the two drivers or part of a campaign to organize BFI (though there was some organizing activity afoot at BFI), or was otherwise directly related to the drivers’ wages or working conditions. It was a gesture of solidarity with the striking workers at the International Harvester plant. Nor, on the other hand, is it suggested that the drivers were trying to disrupt BFI’s business, as a way of inducing BFI to bring pressure on International Harvester to settle with the strikers or even of inducing BFI to stop doing business with International Harvester. There is in short no suggestion that the drivers were fomenting a secondary boycott — concerted, but dis[387]*387favored, activity under the federal labor laws.
But it does not strain the language of section 7 to regard the two drivers as having engaged in a concerted activity that consisted of picketing on the part of some workers and refusing to cross the picket line on the part of others, and that was, at least in part, for the drivers’ own aid or protection and therefore satisfied the mutuality requirement. Only the second proposition — that the drivers themselves benefited — requires elaboration. The drivers may have felt that strengthening the union movement by honoring a union’s picket line would promote their own economic interests as workers. “[T]he solidarity so established [by aiding another employee’s grievance against his employer] is ‘mutual aid’ in the most literal sense.” NLRB v. Peter Cailler Kohler Chocolates Co., 130 F.2d 503, 505-06 (2d Cir.1942) (L. Hand, J.). Judge Hand’s statement is not just “ideological polemics . .. suggestive of a tract on class welfare,” as charged in Haggard, Picket Line Observance as Protected Concerted Activity, 53 N.C.L.Rev. 43, 98 n. 230 (1974), even in a case such as this where the workers in question are not members of a union. They may have hoped to become members— hoped that a union victory at the International Harvester plant would encourage a successful organizing effort at their own plant. Or they may have believed that the union movement improves the working conditions of nonunion workers — that employers treat such workers better in order to ward off unionization. There is a third possibility. We do not know which workers were on strike at the International Harvester plant, but if they do the same type of work that BFI’s drivers do an increase in their wages or benefits through a successful strike might put competitive pressure on BFI to offer better terms to its drivers.
Under any of these hypotheses, the relationship between the challenged conduct and the workers’ practical, nonideological self-interest as workers would be as close as it was in Eastex Inc. v. NLRB, 437 U.S. 556, 569-70, 98 S.Ct. 2505, 2514, 57 L.Ed.2d 428 (1978), where the Supreme Court held that the distribution on the employer’s property of a newsletter criticizing the President’s veto of an increase in the minimum wage was protected activity even though the employees were being paid more than the vetoed minimum wage; and in many other cases as well, such as Kaiser Engineers v. NLRB, 538 F.2d 1379, 1384-85 (9th Cir. 1976), which held that lobbying in opposition to proposed changes in the immigration laws was protected activity.
A natural reading of section 7 leads to the conclusion that refusing to cross a picket line at the premises of an employer’s customer is protected activity, and when we consider, in addition, the pro-union ambience of the Wagner Act, and the Supreme Court’s frequent rejection, as in Eastex Inc., supra, 437 U.S. at 565-67, 98 S.Ct. at 2512-13, of a narrow reading of section 7, we conclude that the natural reading is also the legally correct one.
We are not alone in so concluding. For the last twenty years the Board has held that refusing to cross a picket line at the premises of an employer’s customer is protected activity, see, e.g., Redwing Carriers, Inc., 137 N.L.R.B. 1545 (1962), enforced sub nom. Teamsters, Etc., Local Union 79 v. NLRB, 325 F.2d 1011 (D.C.Cir.1963); Over-nite Transport Co., 212 N.L.R.B. 515 (1974), and its view, so steadily maintained through several changes of Administration, is entitled to consideration. Most circuits that have considered the issue have agreed with the Board, see NLRB v. Southern California Edison Co., 646 F.2d 1352, 1363-64 (9th Cir.1981); NLRB v. Gould, Inc., 638 F.2d 159, 163 (10th Cir.1980); NLRB v. Alamo Express, Inc., 430 F.2d 1032, 1036 (5th Cir. 1970); Teamsters, Etc., Local Union 657 v. NLRB, 429 F.2d 204, 205 (D.C.Cir.1970) (per curiam), though the Tenth Circuit (Gould) only in dictum. Although the Second Circuit is usually grouped with these circuits, on the strength of NLRB v. Rockaway News Supp. Co., 197 F.2d 111, 113 (2d Cir.
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POSNER, Circuit Judge.
The Board asks us to enforce its order finding that the respondent, BFI, committed an unfair labor practice by terminating two workers who refused to cross a picket line at a customer’s premises. BFI is in the business of hauling chemical wastes. It employs six truck drivers, driving six trucks, to pick up the wastes from storage tanks on its customers’ premises and haul them to disposal sites. One of its major customers is an International Harvester plant, whose employees were lawfully on strike, and picketing the plant, between November 1979 and April 1980. On February 19, 1980, International Harvester placed an order that would have required all six of BFI’s trucks to fill. Two of the drivers said they would not cross the picket line, and BFI told them they would be permanently replaced. The next day, before permanent replacements had actually been hired, International Harvester reduced its order to two truckloads, but BFI went ahead and hired permanent replacements.
The first question we consider, one of first impression in this circuit, is whether a refusal to cross a picket line at the premises of an employer’s customer rather than of the employer himself is protected activity under section 7 of the National Labor Relations Act, 29 U.S.C. § 157, which gives workers the right “to form, join or assist labor organizations, to bargain collectively through representatives of their own choosing, and to engage in other concerted activities for the purpose of their mutual aid or protection ... . ” If it is not protected activity then BFI, which is accused only of violating section 8(a)(1) of the Act, 29 U.S.C. § 158(a)(1) (interference with protected activity), cannot be guilty of an unfair labor practice in getting rid of the balking drivers.
The Board does not suggest that the refusal to cross the picket line was concerted action between the two drivers or part of a campaign to organize BFI (though there was some organizing activity afoot at BFI), or was otherwise directly related to the drivers’ wages or working conditions. It was a gesture of solidarity with the striking workers at the International Harvester plant. Nor, on the other hand, is it suggested that the drivers were trying to disrupt BFI’s business, as a way of inducing BFI to bring pressure on International Harvester to settle with the strikers or even of inducing BFI to stop doing business with International Harvester. There is in short no suggestion that the drivers were fomenting a secondary boycott — concerted, but dis[387]*387favored, activity under the federal labor laws.
But it does not strain the language of section 7 to regard the two drivers as having engaged in a concerted activity that consisted of picketing on the part of some workers and refusing to cross the picket line on the part of others, and that was, at least in part, for the drivers’ own aid or protection and therefore satisfied the mutuality requirement. Only the second proposition — that the drivers themselves benefited — requires elaboration. The drivers may have felt that strengthening the union movement by honoring a union’s picket line would promote their own economic interests as workers. “[T]he solidarity so established [by aiding another employee’s grievance against his employer] is ‘mutual aid’ in the most literal sense.” NLRB v. Peter Cailler Kohler Chocolates Co., 130 F.2d 503, 505-06 (2d Cir.1942) (L. Hand, J.). Judge Hand’s statement is not just “ideological polemics . .. suggestive of a tract on class welfare,” as charged in Haggard, Picket Line Observance as Protected Concerted Activity, 53 N.C.L.Rev. 43, 98 n. 230 (1974), even in a case such as this where the workers in question are not members of a union. They may have hoped to become members— hoped that a union victory at the International Harvester plant would encourage a successful organizing effort at their own plant. Or they may have believed that the union movement improves the working conditions of nonunion workers — that employers treat such workers better in order to ward off unionization. There is a third possibility. We do not know which workers were on strike at the International Harvester plant, but if they do the same type of work that BFI’s drivers do an increase in their wages or benefits through a successful strike might put competitive pressure on BFI to offer better terms to its drivers.
Under any of these hypotheses, the relationship between the challenged conduct and the workers’ practical, nonideological self-interest as workers would be as close as it was in Eastex Inc. v. NLRB, 437 U.S. 556, 569-70, 98 S.Ct. 2505, 2514, 57 L.Ed.2d 428 (1978), where the Supreme Court held that the distribution on the employer’s property of a newsletter criticizing the President’s veto of an increase in the minimum wage was protected activity even though the employees were being paid more than the vetoed minimum wage; and in many other cases as well, such as Kaiser Engineers v. NLRB, 538 F.2d 1379, 1384-85 (9th Cir. 1976), which held that lobbying in opposition to proposed changes in the immigration laws was protected activity.
A natural reading of section 7 leads to the conclusion that refusing to cross a picket line at the premises of an employer’s customer is protected activity, and when we consider, in addition, the pro-union ambience of the Wagner Act, and the Supreme Court’s frequent rejection, as in Eastex Inc., supra, 437 U.S. at 565-67, 98 S.Ct. at 2512-13, of a narrow reading of section 7, we conclude that the natural reading is also the legally correct one.
We are not alone in so concluding. For the last twenty years the Board has held that refusing to cross a picket line at the premises of an employer’s customer is protected activity, see, e.g., Redwing Carriers, Inc., 137 N.L.R.B. 1545 (1962), enforced sub nom. Teamsters, Etc., Local Union 79 v. NLRB, 325 F.2d 1011 (D.C.Cir.1963); Over-nite Transport Co., 212 N.L.R.B. 515 (1974), and its view, so steadily maintained through several changes of Administration, is entitled to consideration. Most circuits that have considered the issue have agreed with the Board, see NLRB v. Southern California Edison Co., 646 F.2d 1352, 1363-64 (9th Cir.1981); NLRB v. Gould, Inc., 638 F.2d 159, 163 (10th Cir.1980); NLRB v. Alamo Express, Inc., 430 F.2d 1032, 1036 (5th Cir. 1970); Teamsters, Etc., Local Union 657 v. NLRB, 429 F.2d 204, 205 (D.C.Cir.1970) (per curiam), though the Tenth Circuit (Gould) only in dictum. Although the Second Circuit is usually grouped with these circuits, on the strength of NLRB v. Rockaway News Supp. Co., 197 F.2d 111, 113 (2d Cir. 1952), aff’d on other grounds, 345 U.S. 71, 73 S.Ct. 519, 97 L.Ed. 832 (1953), this classification is mistaken; the Rockaway opinion [388]*388states that honoring a picket line on the customer’s premises is protected activity only if done by the employee after work or otherwise on his own time rather than his employer’s. 197 F.2d at 113. NLRB v. L.G. Everist, Inc., 334 F.2d 312, 316-18 (8th Cir. 1964), is like Rockaway, but a later Eighth Circuit case, Montana-Dakota Util. Co. v. NLRB, 455 F.2d 1088, 1091 (8th Cir.1972), seems to treat the question as open. The First Circuit avoided deciding the question in NLRB v. William S. Carroll, Inc., 578 F.2d 1, 3 (1st Cir.1978), though its opinion seems skeptical of the Board’s position. See also NLRB v. C.K. Smith & Co., 569 F.2d 162, 165 n. 1 (1st Cir.1977).
BFI presses on us cases holding that employers may prohibit union solicitation during working hours, see Republic Aviation Corp. v. NLRB, 324 U.S. 793, 803 n. 10, 65 S.Ct. 982, 988 n. 10, 89 L.Ed. 1372 (1945) (“working time is for work”), and may prohibit slowdowns, see Elk Lumber, 91 N.L. R.B. 333, 336-38 (1950), and other work interruptions, see Excavation-Construction, Inc. v. NLRB, 660 F.2d 1015, 1020-21 (4th Cir.1981). But these cases involve greater potential for disruption of the employer’s business than does a refusal to cross a picket line at a single customer’s premises, since in the latter case the employees remain available to serve their employer’s other customers. Closer are the cases, notably NLRB v. Union Carbide Corp., 440 F.2d 54, 55-56 (4th Cir.1971), and, in the circuit, Gary Hobart Water Corp. v. NLRB, 511 F.2d 284, 287, 289 (7th Cir.1975), which hold that honoring a picketing-line thrown up by workers in a different bargaining unit at the same plant is protected activity. (Hobart overruled, though perhaps inadvertently because it did not cite, NLRB v. Illinois Bell Tel. Co., 189 F.2d 124 (7th Cir.1951).) It would make no difference if it was another plant of the same employer. If it is a plant of another employer the link to the employee’s interest is more attenuated but not so much so as to be outside the Board’s reach in interpreting what appears to be the deliberately broad language of section 7.
There is another reason to treat such conduct as protected. Such treatment allows a more flexible comparison of the benefit to the workers and the burden to the employer. To hold such conduct unprotected would allow the employer to suppress it even if its cost to him was trivial. Holding that it is protected does not make it sacrosanct but does require the employer to demonstrate good cause for suppression — and to the issue of good cause we now turn.
The drivers’ refusal to cross the International Harvester picket line was not provoked by BFI and was therefore like an “economic” strike as distinct from a strike provoked by an employer’s unfair labor practice. Just as a company is allowed to replace economic strikers to keep its business running without being deemed to have interfered with protected activity in violation of section 8(a)(1), so it may continue serving a customer by replacing workers who are unwilling to cross a picket line at a customer’s premises. See Union Carbide Corp., supra, 440 F.2d at 57. No doubt BFI could have survived even if it had been unable to do any business with International Harvester during the five months that the strike was on. But survival is not the test. The Board concedes that BFI did not have to write off any customer — that it could take reasonable steps to continue filling International Harvester’s orders.
The issue can be narrowed still further. On February 19 International Harvester placed an order that would have required all six of BFI’s trucks to fill. BFI could not have been faulted had it gone out that very day and hired permanent replacements for the two drivers who refused to cross the International Harvester picket line. It is difficult to hire temporary replacements— individuals who will have no job security— to cross a picket line and thereby acquire the unlovely sobriquet of scab. The principle is firmly established in the analogous area of economic strikes. “[A]n employer, guilty of no act denounced by the statute, has [not] lost the right to protect and continue his business by supplying places left vacant by strikers.... The assurance by [389]*389respondent to those who accepted employment during the strike that if they so desired their places might be permanent was not an unfair labor practice.... ” NLRB v. Mackay Radio & Tel. Co., 304 U.S. 333, 345 — 46, 58 S.Ct. 904, 910-911, 82 L.Ed. 1381 (1938).
In fact the Board found fault in only two respects with BFI’s response to the drivers’ refusal to cross the picket line. The Board did not think that BFI needed to hire permanent replacements after it found out it would not need six trucks to fill International Harvester’s order; and it thought that BFI had discharged the two drivers rather than merely replacing them permanently, though permanent replacement would have met the company’s legitimate needs just as well.
But neither of these grounds for thinking that BFI went too far is supported by substantial evidence on the record as a whole. On February 15, just a few days before it received the six-truck order that was later cancelled, BFI had filled an order from International Harvester requiring four trucks to fill. The order of February 19 that would have required six trucks was cancelled but BFI could reasonably anticipate receiving such an order in the future that would not be cancelled. Had BFI, while the strike was still on, received an order from International Harvester requiring only five trucks to fill, it would not have been able to fill the order; it had only four drivers who were willing to cross the picket line. Moreover, it could not be sure that all four would be available for work every day — and if one was sick, and International Harvester required four trucks, as it had a few days before, BFI would not be able to fill the order. BFI could of course have used management personnel to drive the trucks, as it had done once before when the other drivers had balked at crossing the picket line, but a company is not required to use its managers to do work that its hourly employees refuse to do for reasons that though honorable are not the company’s fault. BFI was entitled to hire permanent replacements to give itself flexibility in coping with fluctuations in a valued customer’s demands and in its capacity to supply those demands.
It could not lawfully go further and discharge, as distinct from permanently replacing, the balking drivers. Discharge severs the employment relationship entirely; should the discharged worker apply for reemployment he would have to take his turn in the queue with any other applicants. In contrast, a worker who has been permanently replaced jumps to the head of the queue; in addition, he is entitled to notice of job openings; most important, he retains his seniority. If an employer can protect the reasonable needs of his business by permanently replacing a worker he has no right to go further and discharge him. That would unnecessarily burden the exercise of section 7 rights.
But we do not think BFI discharged these two drivers. It told them they were permanently replaced but also that if they made an unconditional offer to return to work they would be rehired when a job opened up. They did not make such an offer. The Board overlooked this undisputed fact when it held that because BFI had not notified them of job openings it must have discharged them despite the language of permanent replacement which it used. The duty to notify of a job opening arises only when the worker has made it clear that he will return to work “unconditionally” — that is, without insisting on the condition that led to his replacement — as soon as a suitable job opening appears. See, e.g., Indiana Ready Mix Corp., 141 N.L.R.B. 651 (1963). Here that would mean agreeing to cross picket lines at premises of BFI’s customers if necessary to enable BFI to fill those customers’ orders. Since the drivers did not make any such offer there is no basis for taking the company’s statement that it was permanently replacing rather than discharging them other than at face value. Therefore BFI was not guilty of an unfair labor practice under section 8(a)(1) and enforcement of the Board’s order must be
Denied.