反独裁民主戦線
Relatively early in Abhisit's premiership, the pro-Thaksin group the United Front for Democracy Against Dictatorship (UDD) began staging anti-government protests. The UDD, also known as the "Red Shirts" in contrast with the PAD's yellow, was formed following the 2006 coup and had previously protested against the military government and staged counter-rallies against the PAD in 2008. In April 2009, the UDD staged protests in Pattaya, where they disrupted the fourth East Asia Summit, and also in Bangkok, leading to clashes with government forces.