These are ISIS, Islamic State in Iraq and Greater Syria, or Islamic State in Iraq and Al-Sham, depending on your source. (Speaking of source... image is from a Google Images search and the text is my own dissemination based on facts from the Council on Foreign Relations, the Wikipedia page on ISIS, Fox Business Network's news update this morning, and again, my own dissemination of the information I have at this time.)
They're a predominantly Sunni militant group organized in (you guessed it....) Iraq and Syria.
And let me tell you what, they are raising some kind of hell in Iraq right now.