Yes and No. Employees that are members and represented by a union cannot file a claim with the Ministry of Labour.
You are covered instead by a collective agreement, whether or not you are a member of your union. You must instead pursue a claim for violation by way of grievance procedure in the collective agreement, if you believe that minimum standards have not been filed. If you are unsure please do not hesitate to contact Matt Lalande and he will be able to assist you.