REUTERS/Sukree Sukplang The United Front for Democracy Against Dictatorship, known as the “red shirts”, led street rallies in 2009 and 2010 in support of Prime Minister Thaksin Shinawatra, who was ousted in a 2006 coup, and staged rallies in 2014 when his sister, Prime Minister Yingluck Shinawatra was toppled in a coup.