瑞典民主黨
Before the Sweden Democrats' entered the [[Riksdag]] in [[2010 Swedish general election|2010]], Karlsson worked as a political secretary for the Sweden Democrats council group in [[Malmö Municipality]]. He was the party's [[press secretary]] at the national level from 2004 to 2010. After the [[2010 Swedish general election|2010 general election]], Karlsson was elected as a [[Riksdag#Membership|Member of the Riksdag]] (SD). In 2012, Karlsson was appointed deputy leader of the Sweden Democrats in the Riksdag.