I. Introduction
One might ask why should anyone study the way terrorists acted, especially now that plenty of them have been arrested and their groups are inactive? The reason is practical. We live in a turbulent world. The issues people face every day in almost every part of this planet may appear with different parameters, but at the root they are common: injustice, social inequalities, violence, war, issues relating to human rights. For each of the aforementioned issues, depending on the recipient, there is a suggested solution; sometimes a more conservative one (from the state's side) and other times a much more extreme one (from the side of revolutionary organizations). European terrorists looked at these issues from a revolutionary perspective. They took a strong position arguing that no change can happen and no improvement will ever be made unless there is exemplary punishment of those who harmed people with their actions or those who undermined their prosperity and freedom. Terrorists had dreams (in fact killing dreams), ideals and a plan of action. They supported their ideas with a system of rules and they set criteria about the way targets should be selected (for example, their involvement in committing crimes of any kind, e.g. political, financial or social). For the innocent bystanders there was only one rule: they should remain safe and away from the operations. As we will see in the next pages though, the revolutionary actions did not prove to be as good and effective as they sounded in theory.