U.S. anti-ISIS military assistance is emboldening Syrian Kurdish Marxist rebels, threatening to destabilize the region for decades. The Kurdish rebels, known as the Yekîneyên Parastina Gel‎ (YPG), subscribe to a Marxist ideology propagated by a jailed terrorist leader. The YPG has deep ties to the Turkish, Kurdistan Worker’s Party (PKK), which is a Kurdish independence group…