Cite as: 517 U. S. 781 (1996)
Opinion of the Court
doubt about a union's majority status at the time the contract was made, when the doubt arises from facts known to the employer before its contract offer had been accepted by the union. We hold that the National Labor Relations Board (NLRB or Board) reasonably concluded that an employer challenging an agreement under these circumstances commits an unfair labor practice in violation of �� 8(a)(1) and (5) of the National Labor Relations Act (NLRA or Act), 49 Stat. 452, 453, as amended, 29 U. S. C. �� 158(a)(1) and (5).
I
Petitioner Auciello Iron Works of Hudson, Massachusetts, had 23 production and maintenance employees during the period in question. After a union election in 1977, the NLRB certified Shopmen's Local No. 501, a/w International Association of Bridge, Structural, and Ornamental Iron Workers, AFL-CIO (Union), as the collective-bargaining representative of Auciello's employees. Over the following years, the company and the Union were able to negotiate a series of collective-bargaining agreements, one of which expired on September 25, 1988. Negotiations for a new one were unsuccessful throughout September and October 1988, however, and when Auciello and the Union had not made a new contract by October 14, 1988, the employees went on strike. Negotiations continued, nonetheless, and, on November 17, 1988, Auciello presented the Union with a complete contract proposal. On November 18, 1988, the picketing stopped, and nine days later, on a Sunday evening, the Union telegraphed its acceptance of the outstanding offer. The very next day, however, Auciello told the Union that it doubted that a majority of the bargaining unit's employees supported the Union, and for that reason disavowed the collective-bargaining agreement and denied it had any duty to continue negotiating. Auciello traced its doubt to knowledge acquired before the Union accepted the contract offer, including the facts that 9 employees had crossed the picket
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