International Freedom Battalion

Leftist fighters in Syria have become useful idiots of neo-imperialism

What would one call a group of left and far-left armed militants who are actively fighting with a singular radical ethnic faction in order to destabilise and ultimately partition a legally recognised state whose government is ironically socialist and anti-imperialist in nature? Furthermore, what would you call it when these leftists are fighting under proxies of the United States who are supported by the genocidal state of Israel and now also the backward, terrorist sponsoring Wahhabi Kingdom of Saudi Arabia?