I'm not sure I heard of any larger Croatian paramilitary unit, are you sure you didn't mix up nations? 
The International Criminal Court (ICC) has tried a number of Croats for war crimes during the Balkan wars, along with Serbs and Muslims. Even Franjo Tuđman is accused of war crimes in Bosnia and Krajina. All the three major ethnic groups committed massacres and other crimes during the war. You can't run away from the accusations.