Beirut-based reporter Sarah El Deeb and Middle East photojournalist Maya Alleruzzo spotlighted efforts by international investigators to bring the Islamic State to justice for the slavery of Iraq’s Yazidi religious minority. The story, which took nearly a year, built on investigators’ documents and El Deeb’s reporting in Iraq and Syria to track down former slaves, owners and those who witnessed the enslavement, all complemented by powerful photos and video of women who had been trafficked.