—(1) If the President is satisfied with respect to any person that, with a view to preventing that person from acting in any manner prejudicial to the security of Singapore or any part thereof or to the maintenance of public order or essential services therein, it is necessary to do so, the Minister shall make an order —
directing that such person be detained for any period not exceeding two years; or
for all or any of the following purposes:
for imposing upon that person such restrictions as may be specified in the order in respect of his activities and the places of his residence and employment;
for prohibiting him from being out of doors between such hours as may be specified in the order, except under the authority of a written permit granted by such authority or person as may be so specified;
for requiring him to notify his movements in such manner at such times and to such authority or person as may be specified in the order;
for prohibiting him from addressing public meetings or from holding office in, or taking part in the activities of or acting as adviser to any organisation or association, or from taking part in any political activities;
for prohibiting him from travelling beyond the limits of Singapore or any part thereof specified in the order except in accordance with permission given to him by such authority or person as may be specified in such order,
and any order made under paragraph (b) shall be for such period, not exceeding two years, as may be specified therein, and may by such order be required to be supported by a bond.
(2) The President may direct that the period of any order made under subsection (1) be extended for a further period or periods not exceeding two years at a time.
(3) For the purposes of subsection (1), “essential services” means any service, business, trade, undertaking, manufacture or calling included in the Third Schedule.
(4) Every person detained in pursuance of an order made under subsection (1)(a) or of a direction given under subsection (2) shall be detained in such place as the Minister may direct (hereinafter referred to as a place of detention) and in accordance with instructions issued by the Minister and any rules made under subsection (5).
(5) The Minister may by rules provide for the maintenance and management of any place of detention and for the discipline of persons detained therein.