Thе National Labor Relations Board (the Board) has petitioned this court for enforcement of its order directing Manufacturer’s Packaging Co., Inc. (the cоmpany) to bargain with Local 387, International Union of Operating Engineers, AFL-CIO (the union) upon the union’s request, and to take other remedial action, for violating section 8(a)(5) and (1) of the National Labor Relations Act (the Act), 29 U.S.C. § 158(a)(5) and (1). We grant enforcement.
I.
The union was certified as the exclusive bargaining representative of the company’s production employees after it prevailed by a vote of 47 to 22 in a Board conducted representation elеction held on April 27, 1979. The company and the union met several *225 times prior to the election to discuss the election. Initially, the parties disagreed on thе proper bargaining unit: the union felt that the sub-supervisors should be included, and the company contended that they should be excluded. On March 9, 1979, the union and the cоmpany stipulated that sub-supervisors should be excluded. The stipulation was approved by the Board’s Regional Director.
The company filed a timely objеction to the election, contending that it had been tainted by the pro-union activities of certain sub-supervisors. Among the challenged activities were the following: two out of the ten sub-supervisors distributed one union card each to an employee, four wore union buttons, three attended union meetings, one signed а union authorization card, one transmitted an employee’s signed union card to another employee, and five made pro-union statements. The evidеnce shows that many of the sub-supervisors’ pro-union statements were made in response to employee inquiries.' Furthermore, with the exception of one pro-union comment by a sub-supervisor, all the challenged activity took place prior to the March 9th stipulation which was made a full seven weeks рrior to the election.
The Regional Director found the company’s objection to the election to be without merit and recommended in his written report that the Board certify the union as the exclusive bargaining agent. The company then filed exceptions to the report requesting either that a heаring be held on its objection or that the election be set aside or both. The Board denied the company’s hearing request and adopted the recоmmendation of the Regional Director that the union be certified as the employees’ exclusive bargaining representative. Shortly thereafter the union wrote the company requesting it to bargain with it, and the company refused.,
II.
The question we must resolve is whether the Board’s conclusion that the election wаs not tainted by the sub-supervisors’ union activities should be upheld. The burden is on the party objecting to an election to show that the challenged activity has prеjudiced the outcome of the election.
NLRB v. Bata Shoe Co.,
The Fourth Circuit has taken a strict approach to extensive supervisory participation in union campаigns. In
Turner’s Express, Inc. v. NLRB,
We do not read
Turner’s Express, Inc.
as establishing a per se rule invalidat
*226
ing a union election if there is any evidence of pro-union supervisory activity. Instead, whether pro-union supervisory activity is sufficient tо overturn an election depends on the facts and circumstances of each case. The critical inquiry is whether the supervisors’ pro-union activities prevented employees from freely effectuating their collective choice.
Schneider Mills, Inc. v. NLRB,
In contrast, the sub-supervisors’ pro-union activities in our case were minimal; most occurred more than seven weeks prior to the election and prior to the time that the sub-supervisors were excluded from the bargaining unit. Unlike the situation in Turner’s Express, there is no evidence in our case that the sub-supervisors initiated or were significantly involved in an offensive strategy to get the company organized. In fact, much of the sub-supervisors’ activities, particularly their pro-union comments, were nоt initiated by the sub-supervisors but were made in response to employee inquiries.
The Board’s conclusions, based upon inferences drawn from conduct, should not be.set aside unless the conclusions transgress the bounds of reasonableness.
See Catholic Medical Center of Brooklyn and Queens, Inc. v. NLRB,
Even if we were to adoрt a per se rule, the record shows that the company knew of sub-supervisory union activity both prior and subsequent to the date when the sub-supervisors were spеcifically designated supervisors and made no attempt to disavow it. If an employer is aware of a supervisor’s union activities and then stands idly by, the employer cannot subsequently rely on the supervisor’s conduct for setting aside a representation election.
NLRB v. Decatur Transfer & Storage, Inc.,
We cannot conclude that the Board abused its discretion in refusing to overturn the election. We thus hold that the election was valid, that the company had a duty to bargain with the uniоn, and that its refusal to bargain constituted an unfair labor practice. Accordingly, we grant enforcement of the Board’s order.
ENFORCEMENT GRANTED.
Notes
. The company claims thаt it was entitled to a hearing on its election objections. A hearing is necessary if there are substantial and material issues of fact relating to the validity of thе election.
NLRB v. Bata Shoe Co.,
