(1) For the purposes of section 103(1)(f), an employee is subject to duress in that employee's employment in relation to membership or non-membership of a union or employees organisation if that employee's employer or a representative of that employer directly or indirectly—
(c) exerts undue influence on that employee, or offers, or threatens to withhold or does withhold, any incentive or advantage to or from that employee, or threatens to or does impose any disadvantage on that employee, with intent to induce that employee—
(v) on account of the fact that the employee is, or, as the case may be, is not, a member of a union or employees organisation or of a particular union or employees organisation, to resign from or leave any employment; or
(2) In this section and in section 103(1)(f), employees organisation means any group, society, association, or other collection of employees other than a union, however described and whether incorporated or not, that exists in whole or in part to further the employment interests of the employees belonging to it.