Edward Snowden, the man responsible for the biggest leak of top secret intelligence files the world has ever seen, gives his first BBC interview to Panorama. Russia has given him sanctuary. America wants him back. With opinion sharply divided, Snowde... (more)n is acknowledged to have raised the debate over privacy and national security to a new level - framing the agenda for this autumn's parliamentary debate over controversial new legislation previously criticised as 'the snoopers' charter'.