What is the primary function of an authorization card in a union context?

The primary function of an authorization card in a union context is to serve as a statement authorizing union representation. When employees sign an authorization card, they are formally indicating their desire for the union to represent them in negotiations with their employer regarding wages, working conditions, and other employment-related issues. This card is crucial for the union as it helps demonstrate that there is sufficient interest among employees to justify pursuing unionization efforts, such as seeking a formal election or negotiating a collective bargaining agreement.

While the other options might involve different aspects of union activities, they do not accurately represent the primary function of an authorization card. Membership fee payments, resignations, and notifications of union elections may be related to union activities but are not the primary intention behind the use of an authorization card. The card specifically signifies an employee's consent for union representation, making it a critical tool in the union organizing process.