Manoonkrit Roopkachorn

On 20 May 2003, Manoonkrit announced his resignation from the posts of Senator and Speaker effective on 4 January 2004, after some members of the upper house tried to force him to step down following a debate calling for an evaluation of his performance. His opponents said he made a promise, during his campaign, to stay in post for two years, so he decided to step down two years before his terms expired in 2006.

Manoonkrit ran for the seat of Senator of Saraburi province on 4 March 2001. He won 140,000 votes, but was disqualified after being accused of buying votes. Manoonkrit won again in the second round of voting on 29 April. His victory was later endorsed due to lack of evidence of fraud.

Manoonkrit returned to Thai politics in the mid-1990s as an advisor to classmate Maj. Gen. Sanan Kachornprasart of the Democrat Party.

On 9 September 1985, the Young Turks again unsuccessfully attempted to topple the government of General Prem, although Prem was abroad at the time. Led by Manoon and his brother, Wing Commander Manas Roopkachorn, he was supported by former Prime Minister Kriangsak Chomanan, former Supreme Commander General Serm Na Nakhon, former Army chief General Yos Thephasdin, former Air Force chief marshal Krasae Intharat and former Air Force chief marshal Arun Promthep. The pre-dawn coup consisted of several hundred men and twenty-two tanks. Within 10 hours, government troops led by General Chavalit Yongchaiyudh quelled the bloody rebellion. There are 59 injuries, 5 casualties, 2 of them foreign journalists. Over 40 active and former military officers were arrested. Exiled pyramid scheme operator Ekkayuth Anchanbutr was widely cited as a financier of the coup, leading some to call the coup the "Share Rebellion". Manoon left Thailand and was dismissed from the service.

On 1 April 1981, the Young Turks took over Bangkok in a bloodless coup, without informing King Bhumibol Adulyadej in advance, as had sometimes happened. The Thai royal family immediately fled to Nakhon Ratchasima Province, along with Prime Minister Prem Tinsulanonda. With royal support for the government thus made clear, Arthit Kamlang-ek led troops loyal to Chavalit Yongchaiyudh and Chulachomklao Royal Military Academy Class 5 in a bloodless counter-coup that recaptured the capital. The coup attempt later became known as the April Fool's Day Coup or the Mesa Hawaii (Thai: เมษาฮาวาย) Coup.

Important military factions in the early-1980s included the Young Turks; the fifth class of the Chulachomklao Royal Military Academy led by Suchinda Kraprayoon; the "Democratic Soldiers", mostly staff officers in counter-insurgency planning; and the military leadership, such as Generals Arthit Kamlang-ek and Pichit Kullavanij, both with close ties to the palace, and Chavalit Yongchaiyudh, a loyalist to Prime Minister General Prem Tinsulanonda. The Young Turks were increasingly frustrated by the military leadership, which they claim had "allowed themselves to be subservient to the rotten political system just to live happily with benefits handed to them by (corrupt) politicians."

Manoon graduated from the Chulachomklao Royal Military Academy in Class 7, along with classmates Sanan Kachornprasart, Chamlong Srimuang, and Pallop Pinmanee. He began serving the Thai military in 1966.

Major General Manoonkrit Roopkachorn (Thai: มนูญกฤต รูปขจร, RTGS: Manunkrit Rupkhachon; born Manoon Roopkachorn, 15 December 1935 in Ayutthaya Province) is a former Thai military officer, senator and President of the Senate of Thailand. A leader of the "Young Turks" clique of military officers, he took part in the coups of 1976 and 1977, in the unsuccessful coups of 1981 and 1985, and in the 2002 corruption case of Prime Minister Thaksin Shinawatra.