She married Zvonko Bušić in 1972 and they lived together in Austria, Germany, Oregon, and Ohio before moving to New York City. They were active in publicizing human rights abuses in the former Yugoslavia, especially the murder of Croatian dissidents by the Yugoslav secret police organization UDBA in the so-called "black program," and in promoting the cause of Croatian independence. Julienne Bušić and a friend were imprisoned briefly in Zagreb in the early 1970s for disseminating literature critical of the Yugoslavian government.