Basij militia aims to dissuade protests through intimidation.
Members have been seen patrolling with portraits of the new Supreme Leader.
Campaign has been ongoing since early March.
Briefing: Members of Iran’s Basij militia mount online intimidation campaign to deter protests
Strategic angle: Heavily armed and dressed in camouflage, members of Iran's Basij paramilitary force have been circulating photos of themselves patrolling the streets of Tehran.