TEXT: Hundreds gather at the memorial center to pay their respects for tens of thousands of people killed in death camps run by Croatia's pro-Nazi puppet state in WWII, in Jasenovac, Croatia, Friday, April 12, 2019.  Croatia's Jewish, Serb, anti-fascist and Roma groups have commemorated the victims of a World War II death camp by snubbing the official ceremonies for the fourth year in a row over what they say is government inaction to curb neo-Nazi sentiments in the European Union country.