A union is negotiating with line managers to hire union members for future openings. Which restricted action is the union proposing?

Collective bargaining refers to the process where employers and unions negotiate terms of employment, such as wages and working conditions. While it is a core function of unions, it does not restrict hiring practices to union members. Instead, it is a strategy to negotiate better conditions for all employees, regardless of union membership.

A secondary boycott occurs when a union encourages others to stop doing business with a company that is being targeted in a labor dispute. This action does not pertain to hiring practices; rather, it aims to apply economic pressure on an employer to meet union demands. Therefore, it does not align with the proposal to restrict hiring to union members.

A wildcat strike is an unauthorized work stoppage initiated by union members without official union leadership approval. While wildcat strikes may reflect employee discontent, they do not relate to hiring practices or the proposal of restricting hires to union members, making this choice incorrect.