Actually, Ustashism much more closely resembled Italian Fascism (not a surprise, since most of the Ustashi in exile spent their time abroad as Mussolini's guests on Lipari) than German Nazism. But that's besides the point since there is no Ustasha party in Croatia today and Ustashism has been rejected by the overwhelming majority of Croatians as a failed political idea.
Croatians served in all branches of the German Wehrmacht the Waffen SS and the SS Police.
ad nauseum
There may not be an official Nazi party in Croatia today but the sentiment is still there...very much alive.
Five out of the nine Prime Ministers of Communist Yugoslavia were Croats.
They seem to be attracted to the extreme left and right.
Not suprising.