Hundreds of unionized workers at Ontario's Workplace Safety and Insurance Board walked off the job in Toronto on Thursday as part of provincial rolling strikes after their union said they were unable to reach an agreement with their employer.

Harry Goslin, president of the Ontario Compensation Employees Union (OCEU), also known as CUPE Local 1750, which represents workers at the WSIB, said on Thursday that both sides have been negotiating for a new collective agreement since Feb. 25. The union w…