4. No association of employees may declare or carry on a strike or organize any concerted action if such strike or concerted action involves a contravention of section 2 by the employees.
An association of employees may, however, declare a strike by proceeding as in sections 111.11 and 111.12 or, as the case may be, 111.0.23 and 111.0.24 of the Labour Code (chapter C-27).