CUPE 2090 and 2588 applied to the labour board after the City brought in replacement workers to do the work of striking members. The City had hired contractors to perform work at various city work sites including the sewage lagoon, cemetery, police station and two arenas.
The board required the City to stop the practice and pay compensation to the locals.
Kyle Videto, president of Local 2090 welcomed the ruling, hoping the City will now get serious about resolving the dispute.
Cranbrook residents deserve better than a council and city administration that has so far taken such extreme measures to avoid dealing with this matter in good faith at the bargaining table, he said.
The 100 members of the inside and outside locals have been on strike since February.