Intervener granted status in certification application based on membership evidence; employer bound by prior agreement on employee list.
The applicant trade union applied for certification for a unit of carpenters employed by the respondent.
The intervener trade union sought to participate, arguing it already represented the employees under existing collective agreements or, alternatively, had membership evidence for at least one affected employee.
The Board found the existing agreements did not cover carpenters but granted the intervener status based on membership evidence filed at the hearing.
The Board also held the respondent could not resile from a prior written agreement with the applicant regarding the list of employees in the bargaining unit, though the intervener remained free to challenge the list.
United Brotherhood of Carpenters' & Joiners of America, Local Union 27 v. Runnymede Development Corporation Limited, 1987 CanLII 3112