I want to know the answer to the following question:
How often was al-Zahf al-Akhdar published?
All the background I'm provided with is that "Responsible for perpetuating revolutionary fervour, they performed ideological surveillance, later adopting a significant security role, making arrests and putting people on trial according to the "law of the revolution" (qanun al-thawra).". Is that enough to answer the question?