The Word Assassin comes from an Islamic Religious-Political Group

The term assassin, one who murders by treacherous violence, comes to us from the Latin assassinus, which was transliterated from the Arabic hashshashin. From the tenth through the thirteenth centuries, “the Assassins” were the Islamic sect in power from Iran to Syria, thanks to their bloody methods. They received their name because they considered it a religious duty to murder their enemies (regardless of religion), and, in order to get up their courage to commit these crimes, they whipped themselves into a “religious” frenzy by smoking hashish. Thus they were “smokers of hashish” — hashshashins — assassins.