He was killed in an attack by the Yugoslav People's Army (JNA) in the town of Borovo Naselje during the Battle of Vukovar.Zadro was interested in Croatian history, particularly the Bleiburg death marches, and was not a supporter of the Communist authorities.[3] In early 1990, due to mismanagement of the Borovo conglomerate, Zadro organized strikes and asked for the dismissal of the director.Speaker of the Croatian Parliament Vladimir Šeks stated "without heroes like Blago Zadro, there would be no free Croatia".[4] A commemoration for him is held every year on the anniversary of his death in Vukovar, attended by many former comrades and political dignitaries.