Context : Karl Helge Hampus Hellekant, later Karl Svensson (born January 30, 1976 in Danderyd, Stockholm County) is a Swedish neo-Nazi who was sentenced to 11 years of prison for the murder of syndicalist union member Björn Söderberg on October 12, 1999. 
Question : Which crime led to the conviction of Hampus Hellekant?
murder