REGINA, Saskatchewan — A judge here has voided union certification at a Wal-Mart store where workers organized under labor laws that were since altered, reports Thursday said.

The United Food and Commercial Workers union was granted certification at Wal-Mart’s Weybern, Saskatchewan, store in December based on a card-signing system, according to the Canadian Press. But labor law since last May has required workers to vote in a secret ballot to choose to be represented, the judge ruled.

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