According to the US state department:
Under al-Jawlani’s leadership, ANF has carried out multiple terrorist attacks throughout Syria, often targeting civilians. In April 2015, ANF reportedly kidnapped, and later released, approximately 300 Kurdish civilians from a checkpoint in Syria. In June 2015, ANF claimed responsibility for the massacre of 20 residents in the Druze village Qalb Lawzeh in Idlib province, Syria.
But the "massacre" cited in the report is disputed and a report from opposition website Yalla Souriya states that the a local killed a JaN fighter which caused the attack.
"One local protested and attacked JAN who sent a person to clarify the situation. The Druze who protested killed the envoy and his friends shot several gunshots killing 3 persons," who may be some of the killed civilians.
http://acloserlookonsyria.shoutwiki.com/wiki/Qalb_Lawzah_Massacre
Is that true that "ANF has carried out multiple terrorist attacks throughout Syria"?