He is the first person to go on trial in Sweden accused of crimes against humanity and was given an eight year prison sentence by a court in Stockholm.
The court heard how he tortured, beat and humiliated muslims in a camp in Mostar where he worked as a guard.
A court in Bosnia-Hercegovina jailed him for the same crimes in 1995, but after being transferred to a prison in Sweden he was released because of a lack of evidence.
Arklöv, who had been involved in Nazi groups in the past, was part of a gang which killed two policemen after a botched bank robbery in southern Sweden, in 1999.
He was also ordered to pay compensation to eleven former detainees in the camp.