LONDON - Islamic State militants must be brought to justice for the sexual enslavement of Yazidis in Iraq, a prominent American lawyer said ahead of the release of a film about the world's first conviction of rape as a war crime."The Uncondemned" tells the story behind the first genocide trial in history and the three rural Rwandan women who overcame their fear and shame to testify about the atrocities perpetrated against them."This film is particularly important given the scale of sexual violence in so many conflicts today," said Pierre Prosper, who led the landmark prosecution at the International Criminal Tribunal for Rwanda (ICTR)."It's a reminder of our responsibility to act. We made legal history back in the 1990s - Rwanda showed us that this is a crime that can and should be prosecuted, but it feels as if the lesson has stopped there."