It's unclear how many Americans have been caught attempting to join or help ISIS, but National Intelligence Director James Clapper has said 180 Americans have tried to go fight in Syria. Experts say most of them are disillusioned young people trying to find purpose or make their mark. While that's largely true, there are outliers. Below are details about some of the cases that have been made public.
On CNN TV: Hear from the people who made the journey inside the minds and the hearts of ISIS. Watch Fareed Zakaria's special report, "Blindsided: How ISIS Shook the World," Monday at 9 p.m. ET/PT on CNN.