Shield of Islam Brigade
Shield of Islam Brigade (Arabic: لواء درع الإسلام) was a small and mostly unknown insurgent group during the Iraq War. Iraq Insurgency 
During the group's active times, Shield of Islam Brigade used sniping tactics during the Iraq Insurgency, they also mostly assassinated people at checkpoints. The group would rarely get any prominence from any other group during the insurgency. They also would do small front-line attacks on Iraqi and U.S. military check points. Even though the group wouldn't get prominence from other insurgent groups, they did receive arms and ally-ship with Al-Qaeda in Iraq. Online presence 
Shield of Islam Brigade posted videos of them assassinating people and uploaded it onto Jihadist forums. References 

Jihadist groups in Iraq
Organizations established in 2005
Defunct organizations based in Iraq
Islamic terrorism in Iraq
Anti-Zionism in Iraq
Organizations designated as terrorist by Iraq