The National Labor Relations Board (the Board) seeks to enforce its orders directing the Typographical Union to rescind the disciplinary actions the Union took against four members who were supervisory employees of the San Rafael Independent Journal (Journal). The Board contends that the Union may not punish these men for violating Union rules and policy, even though they crossed and worked behind the Union’s picket lines.

Gordon Dixon was the mechanical superintendent and the foreman of the composing room. On October 10, 1969, Dixon, exercising his authority as foreman, discharged Paul Austin because Austin took an afternoon off without permission. The Union voted to require Dixon to reinstate Austin, but Dixon refused. The President of the Union *1349 filed charges against Dixon, and, after a hearing, Dixon was fined $418.00.

The Board determined that the Union’s action was an unfair labor practice, and it ordered the Union to rescind the fine and expunge Dixon’s record.

Later, the Union disciplined Robert Dixon, Earl Dixon and Ernest Fingerlos because they crossed the Union’s picket line. On January 7, 1970, the Union struck the Journal after a breakdown in contract negotiations. Robert and Earl Dixon, both assistant foremen in the composing room, ignored the picket line and continued to work. The Union expelled and fined them each $10,000.00 for strikebreaking.

Ernest Fingerlos was the chief machinist. Fingerlos first joined the strike but returned to his job about three months later while the strike was still in progress. The Union expelled Finger-los and fined him $10,000.00.

Gordon Dixon also crossed the picket line and was charged with strikebreaking. The Union had tried him, but at the time of the Board’s hearing, the results were not known to the trial examiner.

The Board found that the Union illegally punished the strikebreakers and ordered the Union to rescind the fines, reinstate the men, and expunge their records.

Section 8 of the National Labor Relations Act, 29 U.S.C. § 158 , defines unfair labor practices. It provides, in part, that:

The Board acknowledges that Section 8(b)(1)(A) does not prevent a union from imposing reasonable fines on members who cross a picket line, or from expelling them. NLRB v. Allis-Chalmers Mfg. Co., 388 U.S. 175 , 87 S.Ct. 2001 , 18 L.Ed.2d 1123 (1967). But the Board contends that here the Union violated Section 8(b)(1)(B) because the members were supervisors.

The Union contends that it can discipline a supervisor for the same reasons it can discipline any other member.

The Union fined Gordon Dixon because he discharged an employee. Dixon acted in his capacity as a foreman empowered by the Journal to punish employees who violate company rules. By fining Dixon, the Union interfered with Dixon’s position as a supervisor and committed an unfair labor practice under Section 8(b)(1)(B). NLRB v. Toledo Locals Nos. 15-P and 272 of the Lithographers and Photo-Engravers Int’l. Union, 437 F.2d 55 (6th Cir. 1971).

The Union’s punishment of the strikebreakers presents a different issue. Although Robert and Earl Dixon and Ernest Fingerlos were supervisors, the Union did not punish them for exercising any management duty.

These three men refused to hon- or the picket line of their Union, and there is no reason to treat them differently than nonsupervisors. The Journal’s right to select management representatives under Section 8(b)(1)(B) is not affected by the Union’s action.

In Allis-Chdlmers, the Supreme Court said that “[t]he economic strike against the employer is the ultimate weapon in labor’s arsenal for achieving agreement on its own terms, and ‘[t]he power to fine or expel strikebreakers is essential if the union is to be an effective bargaining agent . . . . ’ ” Id. 388 U.S. at 181 , 87 S.Ct. at 2007 . Here, the Board’s broad interpretation of Section *1350 8(b)(1)(B) threatens that power. It is an unjustifiable extension of the limited language of Section 8(b)(1)(B). Had the members elected to resign from the Union, the power of the Union over them would have ended. NLRB v. Granite State Joint Board, etc., 409 U.S. 213 , 93 S.Ct. 385 , 34 L.Ed.2d 422 (1972). But here the members remained in the Union, and therefore continued to be subject to their obligations as members.

The Board has not passed on whether the $10,000 fines are unreasonable, and therefore illegal, under Allis-Chalmers. We express no opinion on that issue. The Board must make that determination in the first instance. Morton Salt Co. v. NLRB, 472 F.2d 416 (9th Cir., 1972), petition for cert, filed, March 6, 1973, No. 72-1210.

The issue of whether the expelled members lose their Union benefits is not properly before us, and we express no opinion on that issue.

We grant enforcement of the Board order rescinding the $418.00 fine against Gordon Dixon, and we remand to the Board for further proceedings relative to the $10,000.00 fines. Otherwise, enforcement is denied.