The international community has recognized the growing challenge to peace and security posed by foreign terrorist fighters (FTF), including those supporting ISIL. In September 24, 2014, the United Nations Security Council adopted a series of measures under resolution (UNSCR) 2178 on foreign terrorist fighters while the Global Counterterrorism Forum (GCTF) adopted the Hague-Marrakech Memorandum on Good Practices for a More Effective Response to the Foreign Terrorist Fighter Phenomenon one day earlier. These documents reflect the urgent need of the international community to work together to respond to the FTF threat. As part of that effort, the IIJ co-hosted the sixth workshop in the series of Bringing Terrorists to Justice developed by the United Nation’s Counter-Terrorism Committee Executive Directorate (CTED). This workshop, which was held at the IIJ on December 15-17, brough together prosecutors from more than 20 countries to share experiences and challenges in gathering evidence and, more broadly, in effectively prosecuting cases involving foreign terrorist fighters. This workshop was part of a broader effort by the IIJ to launch a new initiative on how to effectively address the FTF threat within a rule of law framework.