Government officers and employees who are tradesmen or professional persons
4.—(1)  Notwithstanding paragraph 3 and with the prior approval of the Minister for Finance —
(a)Government officers and employees exempted under paragraph 2 who are tradesmen or professional persons may join a union composed of craftsmen or of members following a professional occupation, as the case may be, whose membership is not confined to persons employed by or under the Government; and
(b)any trade union whose membership is confined to the persons set out in paragraph 3(1) may affiliate to or federate with a trade union or federation of trade unions whose membership is not so restricted.
(2)  The approval granted under sub-paragraph (1) may, at any time in the discretion of the Minister for Finance, be withdrawn.