The high court ruled in 2009 that Wal-Mart was entitled to close the store in Jonquiere in 2005, seven months after workers voted to unionize. But the workers filed a new case that said Wal-Mart contravened a section of Quebec labor law, which says working conditions must not be altered in any way, shape or form during a unionization process.
The court ruled in a five-to-two decision Friday that the world's largest retailer modified working conditions for the employees without a valid reason when it shut down.