The British documentary series "Secret War", as it shows how this thing that plagues the entire planet -- got it's start. How it began, in earnest.
How all the nightmare organizations we know of today, how they were found to be so effective that they continued, enlarged, and ran rampant, across the globe.
It illustrates how the various governments and organizations got their 'sea legs' in the world of espionage, and scheming, plotting, etc, during war time, in war torn countries. How this became the preferred and utilized tool during peacetime.
How this horror story really began.