The Workplace Safety and Insurance Act, 1997 (WSIA) is the Ontario tribunal system that compensates employees for workplace injury and disease, to the exclusion of the right to sue in the courts. I haven't practiced significantly in this area but if you have a case I can give you a quality referral from a law school friend who sat as a tribunal member for years.
The federal equivalent for government employees is the Government Employees Compensation Act (GECA), although I haven't seen any cases come down in the federal court system for several years.
