The legality of these amendments was unsuccessfully challenged by Teo in Teo Soh Lung v. Minister for Home Affairs (1989–1990) and Vincent Cheng in Cheng Vincent v. Minister for Home Affairs (1990). Impact of Operation Spectrum Changes to the law The legal challenges mounted by the detainees led the Singapore government to introduce bills in Parliament to amend the Constitution and the Internal Security Act to remove the power of the judiciary in cases related to internal security. Although the Court of Appeal held in the seminal 1988 case Chng Suan Tze v. Minister for Home Affairs that the courts could review the legality of detentions under the Act, the government reversed the effect of the case less than two weeks later, announcing that it would restore the law to its pre-Chng Suan Tze state. Bills seeking to amend the Constitution and the Internal Security Act were introduced and enacted by Parliament on an urgent basis, and they came into force on 25 January 1989. The legality of the amendments was challenged by Teo in Teo Soh Lung v. Minister for Home Affairs (1989–1990) and Cheng in Cheng Vincent v. Minister for Home Affairs (1990) but they were unsuccessful. The amendments were determined to be effective by the High Court and Court of Appeal in 1989 and 1990 respectively, with the Court of Appeal holding that Parliament had effectively turned back the clock to 1971, and so it could not consider whether there were objective grounds for the detention. The Internal Security Act is now shielded from unconstitutionality by Article 149 of the Constitution. Appeals to the United Kingdom's Privy Council were also abolished because the government averred that only the local courts should be involved in matters that involved Singapore's national security. Following this episode, the Maintenance of Religious Harmony Act was passed in 1990 as an additional legal instrument to keep politics and religion separate in Singapore. The law gives the Minister for Home Affairs the power to issue restraining orders against any religious leader whose sermons, speeches or actions threaten Singapore's religious harmony. Gazetting of foreign media The Far Eastern Economic Review, a weekly news publication under Dow Jones Inc., was gazetted and its circulation restricted as a result of an article about the Marxist conspiracy, "New Light on Detentions", that offended the Singapore government. Its circulation was reduced from 9,000 copies to 500 copies per issue