I found this on youtube about how the Macedonians and Croats collaborated before World War II, its in Croatian and its got footage of Vlado Georgiev Crnozemski assassinating the Yugoslav King Karagjorgjevic in Marseille.
According to the Croatian Documentary, HDZ planned everything and Vlado Crnozemski finished the job.
YouTube - ANTE PAVELIC-BEZ MASKE Biografija 2/7