Yes, war crimes were commited but not to such an extent as some other Axis allies. To my knowledge most were commited in Yugoslavia ( may very well be wrong )

General Frenec, for example was extradited back to Yugoslavia after the war and sentenced to death for the massacre in Novi Sad

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler