(a-5) For purposes of this Section, the term "construction employer" means any person or legal entity or group of persons or legal entities engaging in or planning to engage in any constructing, altering, reconstructing, repairing, rehabilitating, refinishing, refurbishing, remodeling, remediating, renovating, custom fabricating, maintaining, landscaping, improving, wrecking, painting, decorating, demolishing, and adding to or subtracting from any building, structure, airport facility, highway, roadway, street, alley, bridge, sewer, drain, ditch, sewage disposal plant, water works, parking facility, railroad, excavation or other project, structure, development, real property or improvement, or to do any part thereof, whether or not the performance of the work herein described involves the addition to, or fabrication into, any project, structure, development, real property or improvement herein described, and shall also include any moving of construction-related materials on the job site or to or from the job site. For purposes of this Section, "labor organization" means an affiliate of an international, national, or statewide organization that has been selected by the Department of Labor to participate in the collective bargaining pilot program as provided for in this Section.