Great movie worth a watch lately called 'The Secret Lives of Others'.  Set in then East Germany prior to the falling of the Berlin wall late 80s early 90ish?!  Film focuses centrally on a Stasi agent, and then playwright and his partner.  Film reminds of the practicalities that apply even where societies have been supposedly more 'closed' in nature, rarely true even, for instance, in ancient Sparta that internal/external exchanges aren't a reality.  Even the most dogmatic/patriotic are human likewise.  Given the probable statistics of information, the volume of peoples working in intelligence gathering, and all the problems that may occur, its not a coincidence that a whistle blower comes forward ensuring revelations of truth are given in time.  One just hopes its sooner rather then later.