Governments have always been interested in the private lives of citizens and surveillance has been an important instrument in maintaining government power and national security. With closer global integration of the recent decades, and especially in a post-9/11 world, security and Government surveillance have gained new impetus, with implications transcending national borders.

Many new surveillance programmes have been adopted in the name of national security, but their implications run further than citizens’ protection. Ben Hayes of Statewatch, Patrick Radden Keefe of The Century Foundation, Larry Siems of PEN America and Jameel Jaffer of the American Civil Liberties Union share their thoughts on the implications of mass surveillance and its challenges to government policy and practice.