1. Chief Ratko Mladic

Mladic was a Bosnian Serb leader that led Karadzic's army. He is a well-known key figure that took part in the ethnic cleansing of Muslims as well as Croats. 

The UN International Criminal Tribunal for the former Yugoslavia indicted Mladic in 1995; however he has yet to be captured.  

He is wanted for genocide, crimes against humanity, and numerous war crimes as well as taking of hostages amongst UN peace-keeping personnel.