Supporters hold posters that read "Freedom for Basam Nguyen Huu Vinh" and "Nguyen Huu Vinh is innocent" during a protest held in front of the People's Court, where prominent dissident blogger Nguyen Huu Vinh stands trial, in downtown Hanoi on March 23, 2016. - A prominent Vietnamese blogger went on trial March 23 on anti-state charges, amid heavy security at Hanoi's central court, with police closing roads and breaking up a protest by dozens of supporters. (Photo by HOANG DINH NAM / AFP)