“ It is understood that an act of terrorism is a violent action, politically motivated, intended to strike objectives of symbolic value and destined also to intimidate a ‘targeted audience’leading back, socially or politically to the primary objective. The act of terrorism, unlike that of ‘political violence’ (ascribable to individuals or groups who tend to act ‘in the open') and that of the ‘guerrilla ’(carried out with instruments and paramilitary logistics) is usually performed by individuals or groups who operate in secrecy or undercover, or in any event, under disguised conditions within the threatened societies ”.