I need you to research Zvonimir Matic and the Spanish city of Zaragoza. Supposedly he was a mayor there during the Franco era and was an Ustasha who fled to Spain in 1945.
Doesn't seem to exist. Any more info, sources?
Ok, I found him. It's funny, the source is in Aragonés, the language spoken by a minority of inhabitants of the region where Zaragoza is.
The article is about the first democratic local elections in Zaragoza. It lists a certain Zvonimir Putizza Matich, not as a major ("alcalde"), but as "teniente de alcalde", literally "lieutenant major" or "vice major". It's a very important position in the municipality. The author says "it's surprising to see this foreign surname among those present there, Zvonimir Putizza, who was a croatian doctor".
That's all I have for the moment. He must be a very obscure character if the only source I can find is in Aragonés.
I've just realized what the problem finding information about him was. Sources refer to him as Zvonimir Putizza, not as Zvonimir Matic. Is Putizza something like a second name? More sources incoming -- I've found an obituary in a francoist 1973 paper about the death of his father, Petar Putizza Juricich, full of details about both of them.