yazidis
The former sex slaves now work as advocates for the persecuted Yazidis.
The Islamic State is using many for sexual slavery or forcing them to fight for the militant group, investigators say.
Investigators say the extremist group is holding at least 3,200 women and children captive.
WHAT'S HAPPENING
The group has targeted and killed members of the Yazidi religion, along with Christians and other religious minorities in Iraq and Syria.
Survivors say there are perhaps hundreds of Yazidi women, girls and boys held as sex slaves and child soldiers in Raqqa, Syria.
"It's still not safe. ISIS could be anywhere."
Members of the minority group worry that messy politics and crushing poverty will only prolong their plight.
A year after the rampage, the difficult road to justice.