Match the categories of bargaining items (in the left column) with their descriptions (in the right column). Mandatory bargaining items Mandatory bargaining items drop zone empty. Illegal bargaining items Illegal bargaining items drop zone empty. Permissive bargaining items Permissive bargaining items drop zone empty. These items are outside the boundaries of the National Labor Relations Act (NLRA). Employers and unions are banned from bargaining over these items. Employers and unions are obliged to bargain over these items