One of Thailand’s most popular anti-establishment politicians has been charged for his role in an illegal flash mob protest last year, in a move that is likely to fuel the current wave of pro-democracy protests. Thanathorn Juangroongruangkit, 41, a charismatic billionaire and founder of the dissolved Future Forward party, is accused of five public assembly violations linked to the rally in Bangkok's central shopping district last December, Krisadung Nutcharat, his lawyer, said on Thursday. The charges include failing to notify police of a public gathering, blocking a sky train station, using a megaphone without permission and holding a rally close to a royal residence. Four other people from his Progressive Movement Group and Move Forward Party face similar charges. All five deny any wrongdoing. Mr Thanathorn has been an outspoken advocate of the protest movement that has gripped the Thai capital, Bangkok, since June, and he recently condemned a short-lived emergency order aimed at...