Question: Marina Petrella  is a former member of the Red Brigades that operated during which an era known as what ?
Sentence (from "Suqour al-Sham Brigades"): In March 2015, the Suqour al-Sham Brigades merged with Ahrar ash-Sham, but left Ahrar al-Sham in September 2016.
Relevant evidence: No