The United Front for Democracy Against Dictatorship, universally known as the Red Shirts or UDD, drew its support primarily from Thailand's rural north and northeast, regions that felt economically marginalized by Bangkok's urban elite. Their allegiance ran to former Prime Minister Thaksin Shinawatra, deposed in the 2006 military coup and living in exile. When the Democrat Party's Abhisit Vejjajiva assumed the premiership in December 2008 through a parliamentary process the Red Shirts viewed as illegitimate, they demanded fresh elections. The government refused. Negotiations over a possible election date collapsed repeatedly, and what began as political rallies hardened into an occupation that would paralyze central Bangkok for weeks.

On April 10, the army moved to disperse the protest camp. The confrontation turned lethal. Soldiers and protesters clashed through the night, and by morning more than twenty people lay dead, including a Reuters cameraman, Hiro Muramoto. The violence did not end the occupation. If anything, it entrenched the protesters further behind their barricades. On May 13, rogue army general Khattiya Sawasdipol, who had aligned himself with the Red Shirts, was shot in the head by an unidentified sniper while giving a media interview; he died four days later. Grenade attacks struck the financial district around Silom Road, and snipers operated from both sides. Medics reported being barred from entering "red zones" to treat the wounded, while the military declared areas under live-fire rules of engagement.

On May 19, the army launched its final assault. Armored personnel carriers pushed through the bamboo-and-tire barricades. Soldiers fired live rounds, and the Red Shirt leaders surrendered one by one, broadcasting their capitulation via television. But the end of the occupation triggered a different kind of violence. Arsonists set fire to CentralWorld, Southeast Asia's second-largest shopping complex, and the blaze gutted large sections of the building. Across Bangkok and in provinces sympathetic to the Red Shirts, government buildings and shopping centers burned. More than thirty buildings were torched in the capital. The Mirror Foundation reported seventy-four people missing in the aftermath, of whom only twenty-three were later found.

The final toll was staggering for a political protest in a country that had not experienced civil war. More than eighty civilians died, along with six soldiers, and over 2,100 people were injured across two months of intermittent violence. Amnesty International condemned the military's "reckless use of lethal force." The UN Secretary-General called on both sides to avert further bloodshed. Foreign journalists were among the casualties: Italian photographer Fabio Polenghi was killed during the final crackdown. The Department of Special Investigation later opened 153 cases related to the protests, but accountability for the deaths remained slow and incomplete, a pattern familiar in Thai political history.

The 2010 protests did not resolve Thailand's political divisions. They deepened them. Abhisit's government survived the crisis but lost the 2011 election to Thaksin's sister, Yingluck Shinawatra, whose Pheu Thai Party won a commanding majority. That result validated the Red Shirts' central claim that they represented the democratic majority, but the cycle continued: Yingluck was herself removed from office, and another military coup followed in 2014. The scorched intersection at Ratchaprasong was rebuilt, CentralWorld reopened, and the Erawan Shrine resumed receiving offerings. But the fault lines that sent tens of thousands of rural Thais into Bangkok's commercial heart to demand a voice in their own governance did not disappear. They went underground, resurfacing in the student-led protests of 2020 and 2021.