Defining ISIS

Supporters of the al-Fadila party perform the simulation of an execution during a protest to ask for justice for members of the Iraqi forces who were executed by ISIS.  Sept. 3, 2014

The terror group ISIS continues to claim more regional territory and grow in ambitions -- as well as erode the traditional religious, cultural, and ethnic lines within Iraq and Syria. Vijay Prashad, Professor of International Studies at Trinity College and columnist for Frontline, discusses what exactly ISIS is today, and what it means for the U.S., British, and regional powers' responses to the growing threat.