A number of political developments and issues preceding the operation had caused mounting political and racial tensions in the country. According to the Malaysian government's
white paper explaining the arrests, various groups had exploited the government's "liberal" and "tolerant" attitude and played up "sensitive issues", thereby creating racial tension in the country. This racial tension, the government said, forced the government to act "swiftly and firmly" to contain the situation.
Background issues The crackdown happened against a backdrop in late 1986 and 1987 of a split within UMNO into two opposing groups, commonly referred to as Team A led by Mahathir, and Team B led by
Tengku Razaleigh Hamzah and
Musa Hitam. Mahathir was challenged for the leadership and narrowly won, but faced a subsequent legal challenge on his win. There were also attacks by the government on several
non-governmental organizations (NGO) which were critical of various government policies. Mahathir called these "intellectual elites" as "tools of foreign powers" and saboteurs of democracy. In addition, a number of race and religion-related issues had arisen which had a cumulative effect in raising ethnic tension. These included the switch to Malay language as a medium of instruction for optional courses in the departments of Chinese and Tamil studies at the
University of Malaya, the use of Chinese characters in certain signboards, the deputy president of the
Malaysian Chinese Association (MCA)
Lee Kim Sai questioning use of the term
pendatang (immigrants) that was seen as challenging Malay's
bumiputra status, as well as rumours of forced conversion to or from Islam.
Vernacular Chinese school personnel controversy The immediate cause, however, was the
Ministry of Education's decision to appoint some 100 senior assistants and supervisors to Chinese-medium primary schools. The boycott was called off at the eleventh hour to allow time for the government to resolve the issue, nevertheless 57 schools went ahead with the strike on 15 October, either because they did not receive the notice of postponement, or they disagreed with the decision.
Response by UMNO Youth Even though the boycott was officially postponed, the stage was set for a response from the Malays led by
UMNO Youth. A mass rally of 10,000 was held at the TPCA Stadium on
Jalan Raja Muda in
Kampung Baru, Kuala Lumpur on 17 October. Many Chinese businesses around the city were closed for a few days for fear of any potential attacks from the Malay ultra-nationalists.
Prebet Adam amok incident To make matters worse, a tinder box situation was created by an unrelated event on 18 October – the rampage of a Malay soldier, widely known as 'Prebet Adam', who killed a Malay and injuring two other persons with an
M16 rifle in the
Chow Kit area, which straddles two large Chinese and Malay communities.
Proposed UMNO rally While Prime Minister Mahathir was away abroad, Sanusi Junid, the UMNO party secretary-general, and other UMNO leaders called for the holding of a large rally in Kuala Lumpur on 1 November to celebrate its 41st Anniversary. The rally was originally to be held in
Johor Bahru but later changed to Kuala Lumpur, where UMNO leaders claimed would see the attendance of half a million members. The rally was cancelled after the Prime Minister returned and Operation Lalang was launched. ==Launch of Operation Lalang==