Original: The SS , through its intelligence arm , the Security Service ( Sicherheitsdienst , or SD ) , dealt with Jews , Gypsies , communists and those persons of any other cultural , racial , political or religious affiliation deemed by the Nazis to be either Untermensch ( sub-human ) or in opposition to the regime , and placed them in concentration camps .
Simplified: The SS , through its Security Service ( Sicherheitsdienst , or SD ) , hunted down Jews , Gypsies , communists and any persons who the Nazis believed to be either Untermensch ( sub-human ) or against the regime .