WASHINGTON, Sept. 4, 2015 — ISIS, arguably the most violent terror group in the world, has again released video of brutal killings of Shia Muslims. In the five-minute video released on Sunday, four Shia Muslims are interviewed one by one. They are told to introduce themselves, state the Iraqi tribe they belong to, and declare that they are members of a militia that defends Iraq from ISIS. ISIS accused the men of spying and of disloyalty to the so-called Islamic state. The video is not the first of its kind, nor will it be the last. Social media and independent news agencies have released videos of men, women and children of different faiths and backgrounds being held in cages and executed in brutal ways by ISIS.