Article 10 (4) of the Constitution permits the government to ban the questioning of Article 153, and thus the social contract; indeed, the Sedition Act does illegalise such questioning. The Internal Security Act (ISA) also permits the government to detain anybody it desires for practically an indefinite period of time, and many, including politicians from the DAP such as Lim Kit Siang and Karpal Singh have been held under the ISA; it is widely believed this was because of their vehement criticism of Malay privileges.