'Most important tactic'The nature of the current protests, and the authorities' reaction, are different to the last major street protests, in November 2019, when Amnesty International accused the authorities of killing at least 321 people in a week of bloodletting.The authorities' "most important tactic now is detaining hundreds, even thousands of people," said Shadi Sadr, director of the London-based Justice for Iran group, which seeks accountability for human rights violations in the Islamic republic.Well known figuresEven before the current surge in arrests, Iran was in the throes of a crackdown that had seen the detentions of prominent figures including filmmakers Jafar Panahi and Mohammad Rasoulof, both of whom remain under arrest.Meanwhile, four Tehran lawyers known for dealing with sensitive cases -- Mahsa Gholamalizadeh, Saeid Jalilian, Milad Panahipour and Babak Paknia -- are all under arrest, the CHRI said.Another prominent victim of the arrest wave was Amiremad Mirmirani, better known as Jadi, one of Iran's most prominent technology bloggers who was picked up on October 5 when security agents stormed his house."