Dead dissidents dumped in a river, activists knotted up by the courts, and Big Brother-style internet laws – critics of Thailand's junta fear this week's election is poised to sharpen the dangers faced by those who disagree.Thais go to the polls on 24 March, in the first election since the 2014 coup that installed the generals in power.But it will be held under new rules established by a junta that has made clear it has no intention of leaving the political stage.Scores of dissident