This case involves the assessment of fines by a union against certain of its members for refusing to honor a sister union’s picket line. The principal issues it presents are:
(1) Was the imposition of any discipline whatsoever an unfair labor practice violation of a no-strike provision in the applicable labor contract; and, if not,
(2) Is the validity of the fines affected by the reasonableness of the amounts ?
Employees of petitioner (hereinafter called “Company”) are represented by two different unions. One union is composed of the warehouse production employees represented by Warehousemen’s Local 858, International Brotherhood of Teamsters, Chauffeurs, Warehousemen and Helpers of America (hereinafter called “Teamsters”). The other is a unit of machinists represented by intervenor union (hereinafter called “Machinists”). Separate collective bargaining agreements were negotiated by each of the unions for their respective bargaining units. The Machinists with whom we are involved were working under an agreement which contained the following “no-strike — no-lockout” clause:
“No-Strike — No-Lockout: During the life of this Agreement, the Union will not cause a strike or production stoppage of any kind, nor will any employee or employees take part in a strike, intentionally slow down the rate of production or in any manner cause interference with or stoppage of the Employer’s work, provided the Employer follows the grievance procedure for which provision is made herein. Likewise, the Employer agrees that there shall be no lockouts during the life of this Agreement provided the Union follows the grievance procedure for which provision is made herein. It shall not be considered a violation of this Agreement if the employees of the Employer fail to report for work by reason of a legitimate, authorized picket line established by another union which has a collective bargaining agreement with the Employer, and sanctioned by the Bay Cities Metal Trades Council or the Central Labor Council having jurisdiction.”
The contract between the Company and the Teamsters expired and the Teamster employees went out on strike to obtain a new contract. Members of the Machinists were told by their shop steward that they were to honor the Teamsters’ picket line. One machinist crossed the picket line and reported for work. He was told by the business representative that his union observed legally sanctioned picket lines; nevertheless, he continued to work for approximately six weeks more, after which he took other employment. For this he was fined and banned from holding a union office for five (5) years. The fine and ban on holding office were ratified by the union membership, and he took no appeal. After the strike continued for approximately nine weeks, six other ma*419chinists threatened to return to work if the strike was not soon settled. They were advised by their business agent that if they did, they would be fined. Nevertheless, two weeks later they crossed the line and returned to work. Charges were filed against all six employees for “conduct unbecoming a member.” They were tried by the union’s trial committee, found guilty and fined $1,000 each and expelled from union membership. The full membership of the union, at their next regular meeting, ratified the penalties.
The company filed unfair labor charges with the NLRB against the union, alleging violation of Section 8 (b)(1)(A) of the National Labor Relations Act. The ease was heard by the Board upon stipulated facts and the Board dismissed the complaint, concluding that the no-strike provision did not protect those employees crossing the Teamsters’ picket line from union discipline, and the fines imposed by the union against these employees did not violate Section 8(b)(1)(A) of the National Labor Relations Act. The Board declined to consider the reasonableness of the amounts of the fines. The Company petitioned for review.
A threshold question raised by intervenor union is whether the Board was barred from adjudicating any issue other than the issue relating to the ex-cessiveness of the fine. The complaint filed by the General Counsel of the Board asserts the Company’s charge that the union committed an unfair labor practice in imposing fines on those members crossing the picket line. During the course of the proceeding the Company moved, pursuant to Section 10(b) of the National Labor Relations Act and Rule 15(b) of the Federal Rules of Civil Procedure to amend the complaint to conform to the evidence; namely, that the union violated Section 8(b)(1)(A) by imposing any penalty whatsoever. The Board denied the motion, ruling in effect that the complaint before it, together with the record, properly raised the issue of whether the assessment of fines was actually an unlawful imposition of penalties for refusing to participate in a work stoppage which violated the no-strike clause. Thus, the Board found it unnecessary to amend the complaint. Intervenor charges that the Board’s adjudication of this issue was wholly beyond its power in view of the specific provisions of Section 3(d) of the National Labor Relations Act, which provides in part as follows:
“(d) There shall be a General Counsel of the Board who shall have final authority, on behalf of the Board, in respect of the investigation of charges and issuance of complaints under section 160 of this title, and in respect of the prosecution of such complaints before the Board, and shall have such other duties as the Board may prescribe or as may be provided by law.”
In support of its argument, intervenor relies on Frito Co. v. NLRB, 330 F.2d 458 (9th Cir. 1964), and NLRB v. Ray-theon, 445 F.2d 272 (9th Cir. 1971). While these cases deny the Board’s jurisdiction to permit amendments to the General Counsel’s complaints, Frito makes it clear that defining the issues presented by a complaint is an adjudicatory function of the Board:
“It is now well settled that the General Counsel’s decision to investigate a charge or issue a complaint is unre-viewable by the Board. However, once the decision has been made to issue a complaint and to prosecute it, the General Counsel has embarked upon the judicial process which is ré-served to the Board. If the General Counsel can control this process, then the General Counsel can indeed usurp the Board’s responsibility for establishing policy under the Act by simply withholding from the Board any issue which might precipitate a meaningful policy decision not in accord with the view of the General Counsel.
In passing, it should be observed that defining the issues which are *420posed by the opposing pleadings has always been regarded as a judicial function.” Frito, supra, at 463-464.
Our review of the complaint, together with the stipulated facts, convinces us that no amendment of the complaint was necessary and that the issues considered by the Board were properly before it.
Analysis of the principal issues presented requires a balancing of the rights protected by Section 7 and Section 8(b)(1)(A) of the Act, together with an interpretation of the above-quoted no-strike provision of the contract :
Section 7: “Employees shall have the right to self-organization, 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 collective bargaining or other mutual aid or protection, and shall also have the right to refrain from any or all of such activities except to the extent that such right may be affected by an agreement requiring membership in a labor organization as a condition of employment as authorized in section 158(a)(3) of this title.” 29 U.S.C. § 157.
Section 8
(b)(1)(A): “(b) It shall be an unfair labor practice for a labor organization or its agents — •
(1) to restrain or coerce (A) employees in the exercise of the rights guaranteed in section 157 of this title: Provided, That this paragraph shall not impair the right of a labor organization to prescribe its own rules with respect to the acquisition or retention of membership therein; ...” 29 U.S.C. § 158(b)(1).
The Company, while conceding that the no-strike provision gave individual employees the right to honor the Teamsters’ picket line, argues that the union, in inducing its membership as a whole to honor the picket line and fining individuals who returned to work, coerced and compelled its members to stop work in violation of the union’s no-strike pledge. This coercion, it is urged, frustrates a fundamental goal of our national labor policy — the peaceful resolution of disputes without resort to work stoppages. We agree, of course, that industrial harmony is fostered by no-strike — no-lockout clauses and that such pledges are in the public interest. However, fundamental to this is that the industrial dispute covered by any such clause be subject to a grievance or arbitration procedure.
“As we have previously indicated, a no-strike obligation, express or implied, is the quid pro quo for an undertaking by the employer to submit grievance disputes to the process of arbitration.” Boys Markets, Inc. v. Retail Clerk’s Union, 398 U.S. 235, 247-248, 90 S.Ct. 1583, 1591, 26 L.Ed. 2d 199 (1970); Textile Workers Union v. Lincoln Mills, 353 U.S. 448, 77 S.Ct. 912, 917, 1 L.Ed.2d 972 (1957).
While a no-strike provision directed to the union amounts to a waiver of a right of that union to regulate certain activities of its members in accordance with union rules, such waiver must be clear and unmistakable and will not be extended by implication to bar regulation of activities not clearly contemplated in the language used. Timken Roller Bearing v. NLRB, 325 F.2d 746, 750-751 (6th Cir. 1963); Mastro Plastics Corp. v. NLRB, 350 U.S. 270, 76 S.Ct. 349, 355-356, 100 L.Ed. 309 (1956). “ . . . statutorily protected rights to strike and to observe picket lines are not to be regarded as waived in the absence of a visible purpose to do so.” News Union v. NLRB, 393 F.2d 673, 677 (D.C. Cir., 1968).
In conformity with these principles, the Board concluded that the no-strike provision is tied to the grievance provisions contained elsewhere in the contract and is not related to the right of the union *421to require its members to honor a sister union’s lawful strike by not crossing its picket lines. The Board contrasts the instant no-strike provision with the clause interpreted in National Grinding Wheel, 176 NLRB No. 89, 71 LRRM 1311 (1969). There, the clause simply stated:
“During the term of this agreement, the company will not conduct a lockout at its plant, and the union or the local union will not cause and permit its members to cause any strike or slowdown, total or partial, of work to the company’s plant.”
Arguing that the no-strike clause only prohibited strikes in the furtherance of the bargaining units’ own demands (as contrasted with honoring a picket line of a sister union’s striking members), the union imposed penalties on those of its members who declined to honor a lawful economic strike of a sister union. In finding an 8(b)(1)(A) violation, the Board stated:
“3. The language of the no-strike clause makes no such distinction. The clause forbids Respondent to ‘cause or permit its members to cause any strike or slow-down, total or partial, of work at the Company’s plant.’ The bulk of Respondent’s members that stayed off the job were engaging in a work stoppage, which, pro tanto, was a partial strike. Whether they did so in furtherance of their own demands or of a cause of the sister-local, their work stoppage suspended the continuity of their operations in either instance. This stoppage of work on their part was in the face of the language forbidding Respondent to ‘cause’ it or even ‘permit’ it.” Id. at 1312.
Here, the no-strike clause expressly reserves the individual employees’ right to honor other unions’ lawful picket lines. While this reservation is not determinative of the issue herein discussed, it does indicate that the clause in question is less restrictive than that in National Grinding Wheel. Additionally, the proviso language specifically conditions the effectiveness of the no-strike pledge on the employer’s acceptance of the grievance procedure included elsewhere therein. As stated by the Board below:
“Moreover, apart from the specific immunity granted employees under the terms of the contract, we think that Respondent’s no-strike commitment was not intended to apply to the instant case. Thus, the no-strike obligation is limited in terms to cases where ‘the Employer follows the grievance procedure.’ The import of that phrase is that the no-strike clause is tied only to disputes that can arise under the contract and thus are amenable to the grievance procedure of the contract. Obviously, a dispute of that nature must relate to some breach of a term and condition of employment. The conduct sought to be induced, however, was not in support of a dispute arising under the employee’s own terms and conditions of employment and thus would not be subject to the grievance machinery provided by Respondent’s contract.” 190 NLRB No. 32, at page 9.
This appears to be a reasonable interpretation of the clause, which we will not disturb on this appeal. Our determination in this regard is also disposi-tive of petitioner’s related challenge of the Board’s order; namely, that the coercive effect of the fines levied against its members was an 8(b)(1)(A) violation of this Section 7 right to refrain from engaging in unlawful concerted action sought by the union. In urging this position, petitioner recognized that NLRB v. Allis-Chalmers and Scofield v. NLRB have “struck the balance” between the right of a union to administer its internal affairs as opposed to the right of its individual members to refrain from concerted action sought by the union.
*422“Section 8(b)(1) makes it an unfair labor practice to ‘restrain or coerce (A) employees in the exercise of the rights guaranteed in [§ 7]: Provided, That this paragraph shall not impair the right of a labor organization to prescribe its own rules with respect to the acquisition or retention of membership therein * * *.’
Based on the legislative history of the section, including its proviso, the Court in NLRB v. Allis-Chalmers Mfg. Co., 388 U.S. 175, 195, 87 S.Ct. 2001, 2014, 18 L.Ed.2d 1123 (1967), distinguished between internal and external enforcement of union rules and held that ‘Congress did not propose any limitations with respect to the internal affairs of unions, aside from barring enforcement of a union’s internal regulations to affect a member’s employment status.’ A union rule, duly adopted and not the arbitrary fiat of a union officer, forbidding the crossing of a picket line during a strike was therefore enforceable against voluntary union members by expulsion or a reasonable fine.” Sco-field v. NLRB, 394 U.S. 423, 428, 89 S.Ct. 1154, 1157, 22 L.Ed.2d 385 (1969).
Having determined above that the “no-strike” provision has no application to the honoring of a lawful picket line of a sister union, the imposition of reasonable fines becomes simply a matter of internal affairs management.
The other issue presented is more troublesome. Apparently, the Board has consistently taken the position, as it has in this case, that it will not examine the amount of otherwise legally imposed fines to determine their reasonableness. Stated another way, the board’s position has been and is in this case that the reasonableness of fines imposed will not be examined by the Board, but, instead, is subject to the exclusive jurisdiction of any state court called upon by the union to assist in collecting the fine from the disciplined employee. This issue is one -of first impression in this circuit and has never been directly before the United States Supreme Court.
Both parties refer us to Allis-Chal-mers and Scofield in support of their respective positions. In Allis-Chalmers the Supreme Court was faced with the question
“ . . . whether a union which threatened and imposed fines, and brought suit for their collection, against members who crossed the union’s picket line and went to work during an authorized strike against their employer, committed the unfair labor practice under § 8(b)(1)(A) of the National Labor Relations Act of engaging in conduct ‘to restrain or coerce’ employees in the exercise of their right guaranteed by § 7 to ‘refrain from’ concerted activities.” NLRB v. Allis-Chalmers Manufacturing Company, 388 U.S. 175, 176, 87 S.Ct. 2001, 2004 (1967).
After a detailed review of the legislative history of the provision, the Supreme Court concluded that it was not an unfair labor practice for a union to impose reasonable fines upon those of its members who work during an authorized strike. However, the precise issue we face here, that is whether the Board or an enforcing court should determine reasonableness, was not before the Supreme Court.
In Scofield, the Supreme Court dealt with the legality of union fines imposed upon members disregarding a piecework ceiling rule set by their union. Again, the court examined the interplay between Sections 7 and 8(b)(1)(A), reaffirming its decision in Allis-Chalmers, with the conclusion that
“A union rule, duly adopted and not the arbitrary fiat of a union officer, forbidding the crossing of a picket line during a strike was therefore enforceable against voluntary union members by expulsion or a reasonable fine.” Scofield, supra, 394 U.S. at 428, 89 S.Ct. at 1157.
*423While, again, the issue was not squarely presented to the Supreme Court, we particularly note the adjective “reasonable” in the above-quoted portion of the opinion used in the context of enforceability and legality of the fine. The corollary of this Scofield conclusion is that an unreasonable fine is an unfair labor practice. A statutory responsibility of the Board is to adjudicate and remedy unfair labor practices. NLRA § 10(a); 29 U.S.C. § 160(a). We conclude that the determination of reasonableness is for the Board.
A similar conclusion was reached by the Court of Appeals for the District of Columbia Circuit [Booster Lodge No. 405, Int. Ass’n of Machinists and Aerospace Workers v. NLRB, 459 F.2d 1143, (D.C. Cir. 1972)], which involved a consideration of the “legal implications of the ‘reasonableness’ of the fines imposed, where the union has threatened enforcement thereof, or has actually sought collection through legal means.” The Court concluded that,
“Since the imposition of an unreasonably excessive disciplinary fine is vio-lative of Section 8(b)(1)(A), it is clearly the obligation of the N.L.R.B. to resolve the question of reasonableness where such an issue is appropriately raised.” Booster Lodge, supra, 459 F.2d at 1157.
In addition to interpreting Allis-Chal-mers and Scofield as supportive of its position, the District of Columbia court recognized that access to the Labor Board by the disciplined employee is more readily available than meaningful access to state courts. Furthermore, the court noted the desirability of having reasonableness of fines determined by standards that are as nearly uniform as national standards promulgated by the Board can be. We agree that the lawfulness of fines imposed depends, in part, upon the reasonableness of the amount, and that the NLRB is the proper forum for this determination.
Accordingly, we remand to the Board for further proceedings consistent herewith.