The applicant union referred a grievance to the Board under section 112a of the Labour Relations Act, alleging the respondent employer failed to apply the province-wide excavation collective agreement.
At the hearing, the employer raised a preliminary objection, arguing that it was bound by a different 'road builders' agreement and that other employers and unions bound by that agreement were entitled to notice of the proceedings because the Board's interpretation might affect them commercially.
The Board dismissed the preliminary objection, holding that strangers to a collective agreement are not entitled as of right to intervene in a section 112a proceeding, and declined to exercise its discretion to add them, as doing so would needlessly encumber the grievance process.