I believe the word your looking for is Hashashin. From the word Hashish, it means weed smoker. They where an extreme shia sect from the mountains of Syria known for assassinating high profile targets anywhere at any time. Also for being big time pot headsChappo living good merking and intimidating people who care about money.
You can't stop a man who doesn't give a fukk about his own life.
Yall better look up Hassan-i Sabbāh. Google that man's name, he created the fedayeen.
The word assassian in in the english language based off him and his followers.
Doesn't matter how many killers you have, how much money you have, you can't stop killers ready to give there life for a belief.
Fadayeen on the other hand is Arab guerrillas particularly the ones that fought against Israel in the early days. Saddam and a few other ME dictators also had Fadayeen armys.