During a hearing for a request to reconsider a decision consenting to the early termination of a collective agreement, the intervening union (USWA) sought to introduce union membership cards to corroborate evidence of an organizing campaign.
The incumbent union and the employer objected, arguing that if the cards were admitted, they should be entitled to examine them, including the identities of the signatories.
The Board held that section 111(1) of the Labour Relations Act protected the confidentiality of the cards even outside a certification application.
Balancing the limited probative value of the cards as hearsay evidence against the potential prejudice to the other parties and the legislative intent to protect union membership confidentiality, the Board exercised its discretion to refuse to admit the membership cards into evidence.