The Société de transport de Montréal (STM) will face an overtime strike by its professional staff over the holiday period, after members of the Union of Professional and Office Employees, Local 610 (SEPB-610), filed a strike notice with Quebec’s Administrative Labour Tribunal.

The measure, covering roughly 800 professionals, is set to run from Dec. 17 through Jan. 11.

Related: • STM administrative staff approve 5-year contract, maintenance workers move toward OT strike • STM and maintenance workers’ union disagree on holiday staffing during strike • STM could save $3,500 a day with 100% electric bus fleet: Concordia study • Another STM union set to strike

“For our members, this is a fundamental breach of trust in management,” said Benoit Tessier, Vice-President of SEPB-610. “The

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