Thomas Hughes is executive director of ARTICLE 19, an international human rights organisation that defends freedom of expression and the right to information.
A new film, CITIZENFOUR, examines the extraordinary reach of today's surveillance culture and calls for a proper system of proportion and accountability.
Mass surveillance has to end, on June 7th we're having a day of action to consider how we can make that happen. Let's face it, the government has no intention of rolling back surveillance unless the public make them.