(1) If an Act recites that action has been taken or threatened by any substantial body of persons, whether inside or outside Singapore —
(a) to cause, or to cause a substantial number of citizens to fear, organised violence against persons or property;
(b) to excite disaffection against the President or the Government;
(c) to promote feelings of ill-will and hostility between different races or other classes of the population likely to cause violence;
(d) to procure the alteration, otherwise than by lawful means, of anything by law established; or
(e) which is prejudicial to the security of Singapore,
any provision of that law designed to stop or prevent that action or any amendment to that law or any provision in any law enacted under clause (3) is valid notwithstanding that it is inconsistent with Article 9, 11, 12, 13 or 14, or would, apart from this Article, be outside the legislative power of Parliament.
… (Art. 149)