Watchers - not Men in Black

Due to questions on surveillance, I thought it worth clarifying that this does not always mean photography. Sometimes simpler is better.
How observant are you when walking down the street? And do you thinkyou could follow people around without them knowing?
Watching and following people. Sometimes in a car or on foot, and in some cases also photographing them.
This involves long periods of waiting but which at any moment could require concentration when something finally happens.
During the Cold War, "watchers" followed suspected KGB officers around and run observation posts outside the Soviet embassy to watch diplomats come and go, and try to establish who their contacts might be. Now the surveillance focuses on terrorist cells
And then comes the question. Are you being watched? is someone watching the watcher?
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