even when a sizable proportion of the workers sign authorization cards the victory is by no means guaranteed. management rarely is passive during the organization drive see tips for success . although laws govern what management can and cannot do management in an organization may attempt to persuade potential members to vote no. union organizers realize that such persuasion may work and thus unions usually require a much higher percentage of authorization cards to increase their odds of obtaining a majority. when that majority vote is received the NLRB certifies the union and recognizes it as the exclusive bargaining unit. whether the individual individual in the certified bargaining union voted for or against the union each worker is covered by the negotiated contract and must abide by its governance.