Khidher Domle, a Yazidi activist, has coordinated rescues of many of these hostages. A professor, journalist, and the head of the Communications Department at the University of Dohuk in Kurdistan, Iraq, Mr. Domle will testify this week before the U.S. Congress.

The event will also include an exclusive screening of clips from Extreme Good, a documentary based on Mr. Domle’s experience that is currently in development.