They are from all nationalities. They dwell in the mythology of the International Brigades of the Spanish Civil War. They chose to give up their comfortable lives and go fight ISIS in Syria. Every night, between July and October 2017, young men with no previous military experience pushed through the most dangerous streets of the world. Eventually, along with the Kurdish and Arab forces of the Syrian Democratic Forces, they liberated Raqqa and ended the reign of the most murderous cult of the 21st century