At the same time as the political and judicial crises, Mahathir initiated a crackdown on opposition dissidents using the Internal Security Act. Mahathir later declared that it was only used to lock up people accused of riots, unlawful assembly, terrorism and those who have murdered police officers. The appointment of several administrators who did not speak Mandarin to Chinese schools provoked an outcry among Chinese Malaysians to the point where UMNO's coalition partners the Malaysian Chinese Association and Gerakan joined the Democratic Action Party (DAP) in protesting the appointments. UMNO's Youth wing held a provocative protest that triggered a shooting by a lone Malay gunman, and only Mahathir's interference prevented UMNO from staging a larger protest. Instead, Mahathir ordered what Wain calls "the biggest crackdown on political dissent Malaysia had ever seen". Under the police operation codenamed "Operation Lalang", 119 people were arrested and detained without charge under the Internal Security Act. Mahathir argued that the detentions were necessary to prevent a repeat of the 1969 race riots. Most of the detainees were prominent opposition activists, including the DAP leader, Lim Kit Siang, and nine of his fellow MPs. Three newspapers sympathetic to the opposition were shut down. Mahathir suffered a heart attack in early 1989, but recovered to lead Barisan Nasional to victory in the 1990 election. Semangat 46 failed to make any headway outside Razaleigh's home state of Kelantan.