An employer or a person acting on behalf of an em-ployer must
a) discharge, suspend, transfer, lay off or otherwise disci-pline an employee, refuse to employ or to continue to employ a person or discriminate against a person in regard to employment or a condition of employment because the person
i) is or proposes to become or seeks to induce another person to become a member or officer of a trade un-ion, or
ii) participates in the promotion, formation or administra-tion of a trade union,
b) discharge, suspend, transfer, lay off or otherwise disci-pline an employee except for proper cause when a trade union is in the process of conducting a certifica-tion campaign for employees of that employer,