Key figures: Thaksin Shinawatra (deposed Prime Minister); General Sonthi Boonyaratglin (Royal Thai Army commander and coup leader); King Bhumibol Adulyadej (reigning monarch); the Council for Democratic Reform under the Constitutional Monarchy (CDRM), later the Council for National Security
Summary
On the night of September 19, 2006, the Royal Thai Army staged a bloodless coup d’état against the elected caretaker government of Prime Minister Thaksin Shinawatra, who was in New York City attending the United Nations General Assembly. Led by army commander General Sonthi Boonyaratglin, tanks and troops moved into central Bangkok and seized key government buildings and television stations without firing a shot. It was Thailand’s first military coup in 15 years, ending a period that many had hoped marked the country’s consolidation as a stable democracy.
The junta, styling itself the Council for Democratic Reform under the Constitutional Monarchy (CDRM), abrogated the 1997 “People’s Constitution,” dissolved parliament and the Constitutional Court, cancelled scheduled elections, declared martial law, banned political gatherings of more than five people, and imposed media censorship. King Bhumibol Adulyadej endorsed the coup leaders shortly afterward, lending the intervention crucial legitimacy in Thai politics. Thaksin did not return from New York to contest the takeover.
Background: Thaksin Shinawatra and the Crisis of 2005–2006
Thaksin’s Rise
Thaksin Shinawatra was born on July 26, 1949, in Chiang Mai and built a business empire in telecommunications through the 1990s, including the Shin Corporation. He founded the Thai Rak Thai (TRT) party in 1998 and won the January 2001 general election with an overwhelming majority on a platform of rural economic development, debt relief for farmers, universal healthcare (the “30-Baht scheme”), and village development funds.
These populist policies — the 30 Baht Healthcare Scheme (which capped co-payments at 30 baht, about $0.75, per hospital visit) and Village Fund (one million baht to each village) — were transformative for rural Thailand, generating extraordinary loyalty among voters in the north and northeast. In the February 2005 general election, Thaksin’s party won 375 of 500 seats — the largest parliamentary majority in Thai democratic history — making him the first Thai prime minister to serve a full term and win re-election.
The Political Crisis
Despite his electoral strength, Thaksin faced accumulating opposition from Bangkok’s urban middle class, royalist establishment, and military:
Conflicts of interest and corruption allegations: Thaksin’s telecommunications empire created persistent conflicts of interest concerns, particularly around the regulation of mobile phone licenses. In January 2006, his family sold its stake in Shin Corporation to Temasek Holdings (Singapore) for 73.3 billion baht ($1.9 billion) — a transaction structured to avoid Thai capital gains tax through a legal loophole, generating enormous public outrage among urban Thais who saw the tax-free sale as emblematic of elite corruption.
The “Yellow Shirt” movement: The sale triggered the emergence of the People’s Alliance for Democracy (PAD), popularly known as the “Yellow Shirts” (yellow being associated with the monarchy). Beginning in February 2006, the PAD organized massive street protests in Bangkok, calling for Thaksin’s resignation and alleging corruption and lèse-majesté (disrespect to the monarchy). Protests peaked in March 2006, with estimated crowds of 100,000 in Bangkok.
The snap election and boycott: Thaksin called a snap election for April 2, 2006, hoping to receive a fresh mandate. The three major opposition parties — Democrat, Chart Thai, and Mahachon — boycotted the election, arguing it was unconstitutional to hold elections without proper party nominations. The result: TRT won nearly all contested seats but failed to meet the constitutional threshold for confirming the prime minister, as some constituencies had no competing candidates and thus fell short of the required 20% turnout. The Constitutional Court subsequently voided the election in May 2006.
A second election was scheduled for October 15, 2006 when the coup preempted it.
The Coup: Night of September 19, 2006
At approximately 9:00 p.m. local time on September 19, tanks and armored vehicles moved through central Bangkok. The Council for Democratic Reform under the Constitutional Monarchy (CDRM) — led by General Sonthi Boonyaratglin, the first Muslim to command the Royal Thai Army — announced on state television that it had seized control of the government. Troops surrounded Government House (the prime ministerial offices) and key media broadcasting facilities without resistance. Caretaker Deputy Prime Minister Chitchai Wannasathit, filling in while Thaksin was abroad, made no attempt to organize resistance.
Thaksin learned of the coup while in New York and immediately declared a state of emergency via satellite television — an act which the coup leaders ignored. He did not return to Thailand, beginning what became years of self-imposed exile. The coup was explicitly timed to occur while Thaksin was out of the country, reducing the possibility of him rallying support.
King Bhumibol, who was in hospital in Bangkok, had not been consulted in advance by the coup leaders but endorsed the CDRM’s leadership list within 48 hours — a crucial step given the monarchy’s central constitutional and moral authority in Thai politics.
Junta Actions and Transition (2006–2007)
Immediate Measures
The CDRM (renamed the Council for National Security, CNS, within days) took the following immediate steps:
- Abrogated the 1997 Constitution — Thailand’s most participatory and rights-protective constitutional document, drafted after the 1992 pro-democracy uprising
- Dissolved the National Assembly, the Cabinet, and the Constitutional Court
- Cancelled the October 15, 2006 election
- Declared martial law across Thailand
- Imposed a ban on political meetings of more than five people
- Temporarily suspended internet access to some websites and state television programming
Constitutional Drafting and 2007 Referendum
The CNS appointed a National Legislative Assembly and a Constitution Drafting Assembly to produce a new constitution. The 2007 constitution, approved in a referendum on August 19, 2007 by 56.7% of voters (with voter turnout of approximately 57%), was drafted under conditions critics described as unfair: criticism of the draft in the media was restricted, and the campaign for a “No” vote was hampered. Critics argued the 2007 constitution reduced the number of directly elected MPs, weakened political parties, and enhanced judicial and military oversight of elected governments — structural features designed to constrain future Thaksin-linked governments.
December 2007 elections returned a Thaksin-linked party (People’s Power Party, PPP) to power with 233 of 480 seats, demonstrating that the coup had not shifted the political loyalties of Thailand’s rural majority.
Significance
The 2006 coup opened a prolonged era of political instability that has shaped Thailand ever since. Rather than resolving the country’s divisions, the intervention entrenched them, crystallizing a lasting confrontation between the pro-Thaksin “Red Shirt” movement — drawing on rural and working-class support — and the royalist, urban, and military-aligned “Yellow Shirt” establishment. This confrontation produced:
- A second “Yellow Shirt” occupation of Bangkok’s airports in November 2008, forcing the PPP government to resign
- “Red Shirt” protests and a military crackdown in May 2010 that left approximately 91 dead
- Thaksin’s sister Yingluck Shinawatra winning the July 2011 election — only to be removed by a Constitutional Court ruling in May 2014
- A second military coup on May 22, 2014, led by General Prayut Chan-o-cha, which installed a junta in power for five years
For a country that many observers had regarded as one of Southeast Asia’s more promising democracies, the 2006 coup was a decisive reversal that reasserted the military and palace as the ultimate arbiters of Thai politics. It became a defining case study in “coups against elected populists,” with parallels drawn to subsequent military interventions in Egypt (2013) and Myanmar (2021).