THE HAGUE — Radovan Karadzic, the former Bosnian Serb leader, was convicted of genocide, war crimes and crimes against humanity, by a United Nations tribunal on Thursday for leading a campaign of terror against civilians that included the slaughter of 8,000 Bosnian Muslims at Srebrenica in 1995 and the nearly four-year siege of Sarajevo. Mr. Karadzic, 70, was sentenced to 40 years in prison. The United Nations International Criminal Tribunal for the Former Yugoslavia convicted Mr. Karadzic of genocide for the Srebrenica massacre, which aimed to kill “every able-bodied male” in the town and systematically exterminate the Bosnian Muslim community...