I have to admit that I may have been wrong in my previous assertions that crowds are not easily incited by charismatic leaders, as evidence has emerged from the recent disturbances in Greece to suggest that the protestors have a leader who has been seen at the forefront of the angry masses confronting the Police- see the link below for the proof.
My sources tell me his name is Fido (or some Greek equivalent) and he never misses a riot in Athens (if he's not busy gnawing a good bone)!
http://www.bbc.co.uk/news/world-europe-13802940
