The 1 SS Infantry Brigade (mot) was a unit of the German Waffen SS formed from former concentration camp guards for service in the Soviet Union behind the main front line during the Second World War. They conducted anti-partisan operations in the rear of the advancing German army and were involved in the extermination of the Jewish population. They also filled gaps in the front line when called upon in emergencies. In 1944 the Brigade was used as the cadre in the formation of the 18th SS Volunteer Panzergrenadier Division Horst Wessel.