The organizations like that are first and foremost political organizations and secondly terrorist organizations in that they will use terror as a means to an end, not organizations that promote terror for terrorism sake, that's why in the early days of the Republic, we never had the word "terrorism" it was just vile enemy that did thus and so. It is what got the Marines to Tripoli the first time, because various princes and factions in the Ottoman empire figured it was cool to hijack and ransom American ships. The official Ottoman government said they were not responsible but would "allow" an American expedition into their zone of influence, So the US went after some of their nominal outposts by encouraging tribal rebellion and taking sides with one of the tribes. That's basically the first overseas battles of the US Marines.