Imad Fayez Mughniyeh, also known by his nom de guerre al-Hajj Radwan, was a Lebanese militant leader who was the founding member of Lebanon's Islamic Jihad Organization and number two in Hezbollah's leadership. He is believed to have been Hezbollah's chief of staff and overseer of its military, intelligence, and security apparatus. He has been described as a skilled military tactician and a highly elusive figure. He was often referred to as an ‘untraceable ghost’.