In 2006, after the militarystaged a coup and revoked the constitution, Ungpakorn led a demonstration by university students in downtown Bangkok. He was later accused of lèse majesté for writing a book called A Coup for the Rich, where he argued that the coup was illegitimate and supported by the king. Ungpakorn is widely known as an activist with the socialist Turn Left Thailand group.. In February 2007, his English-language academic workA Coup for the Rich was refused distribution by the Chulalongkorn University bookstore. His use of the controversial The King Never Smiles, which he has reviewed and criticised, as a reference was the explanation given by the store manager. Ji was formally charged with lese majeste in Bangkok on 20 January 2009. He had 20 days to respond to the charges, after which the Thai authorities would decide whether his case would be given to the Thai courts for prosecution. Ji said he was being charged because of the contents of his book A Coup for the Rich, which points out the reasons the coup in Thailand two years prior took place. He fled Thailand in February 2009, returning to the United Kingdom. He stated, "I did not believe I would receive a fair trial." Ji is a self-declared republican and a vocal opponent of the Thai monarchy and the military. While fleeing Thailand, he wrote Red Siam Manifesto, which explicitly criticised King Bhumibol Adulyadej. He has criticised King Bhumibol for being a "weak, unprincipled" monarch who has never supported democracy, and holds the army, the elites, and the king responsible for supporting the Thammasat University Massacre of 1976. He has denounced the king's much-touted sufficiency economy, branding it an arrogant commandment for the poor to know their place, while the king is the richest monarch in the world. Ji also declares himself a Marxist. He is a member of the Thai socialist group Turn Left Thailand, which is part of the Trotskyist International Socialist Tendency. Ji is also a Red Shirt and member of Kon Thai UK, a Red Shirt organisation in the UK. In an opinion piece written for the Asia Sentinel website he discounted the prospects of a successful social and political reform, and has aligned himself with those who are calling for a social revolution to occur in Thailand. Giles has also criticised those who advocate armed struggle. His latest English language book, Thailand's Crisis and the Fight for Democracy, published in early 2010, is Ji's attempt to explain the present situation in Thailand before the Red Shirt demonstrations and clashes with the military in April and May 2010. A blog with the name "Ugly Truth Thailand" is run under Ji's name. It talks about many controversial topics of Thailand's politics.
