Operation Lalang

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Prehistoric Malaysia Paleolithic  Lenggong Valley c. 2.000.0000 BCE  Mansuli Valley 235,000 BCE Mesolithic  Niah cultures 65,000–40,000 BCE Neolithic  Bewah man/woman 16,000 BCE  Perak man/woman 11,000–200 BCE  Neolithic Klang 500 – 200 BCE
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Formative era BMA of Malaya/Borneo 1945–1946 Crown Colony of N. Borneo 1946–1963 Crown Colony of Sarawak 1946–1963 Anti-cession movement 1946–1963 Malayan Union 1946–1948 Federation of Malaya 1948–1963 Sungai Siput incident 1948 Malayan Emergency 1948–1960 Batang Kali massacre 1948 Bukit Kepong incident 1950 Baling Talks 1955 Malayan Independence 1957 Singapore Self-governance 1959 ISA 1960 1960–2012 Communist insurgency in Sarawak 1962–1990 North Borneo Self-governance 1963 Konfrontasi 1963–1966 Sarawak Self-governance 1963 Formation of Malaysia 1963 Singapore in Malaysia 1963–1965 ASEAN Declaration 1967 Second communist insurgency 1968–1989 13 May incident 1969 National Operations Council 1969–1971 Declaration of Rukun Negara 1970 New Economic Policy 1971–1990 Peace Agreement of Hat Yai 1989
Barisan Nasional era Federal Territory of KL 1974 1977 Kelantan Emergency 1977 Pedra Branca dispute 1979–2008 South China Sea dispute (Spratly) 1980–present Federal Territory of Labuan 1984 Memali incident 1985 Operation Lalang 1987 Constitutional crisis 1987–1988 Royal Immunity Amendments 1993 Financial crisis 1997–1998 Reformasi Movement 1998–2022 1MDB scandal 2015–present
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This article is part of a series about Mahathir Mohamad
Early life Electoral history Political positions Awards and honours Prime Minister of Malaysia First term (1981-2003) North-South Expressway MSC Malaysia Proton Holdings Wawasan 2020 National Development Policy 1993 constitutional amendment Bangsa Malaysia Operation Haze Reformasi "Asian values" Putrajaya Petronas Towers Second term (2018-2020) Shared Prosperity Vision 2030 International trips THM fund Borneo states bill 2020 political crisis Cabinets I II III IV V VI VII Political parties UMNO (1964–2016) BERSATU (2016–2020) PEJUANG (2020–2023) PUTRA (2023–present) Coalitions Alliance Party (1964–1974) Barisan Nasional (1974–2016) Pakatan Harapan (2017–2020) Gerakan Tanah Air (2022–2023) Family Siti Hasmah Mohamad Ali Mukhriz Mahathir Mokhzani Mahathir Marina Mahathir Related KL War Crimes Commission The Malay Dilemma Citizens' Declaration Asian values Bangsa Malaysia Teater Tun Siti Hasmah Mahathir, the Musical Mahathir Science Award Foundation Gallery Quotes
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Operation Lalang (Malay: Operasi Lalang, also called Ops Lalang and taken to mean "Operation Weeding") was a major crackdown undertaken by the Royal Malaysian Police from 27 October to 20 November 1987, ostensibly to prevent the occurrence of racial riots in Malaysia. The operation saw the arrest of 106 to 119 people—political activists, opposition politicians, intellectuals, students, artists, scientists and others—who were detained without trial under the Internal Security Act (ISA). It was the second largest swoop in Malaysian history involving the ISA since the 13 May riots 18 years earlier. It also involved the revoking of the publishing licenses of two dailies, The Star and the Sin Chew Jit Poh and two weeklies, The Sunday Star and Watan.

The Malaysian government argued that racial tensions had reached a dangerous level within the country, forcing the government to arrest those responsible for stoking the tension. The notion that racial riots were imminent however is contested, and it is widely believed that the operation was designed to control the political opponents of the Prime Minister Mahathir Mohamad through draconian measures. The event marked the beginning of a period of Mahathir's authoritarian rule on the country.