Image gallery for: An evil method of execution by the ustasha on serbs jews and roma gypsies during the nazi holocaust years in croatia yugoslavia heavy long handled wooden mallet club as of the type used by the ustasha militia and black legion in the croatian concentration camps particularly as was evident and recorded in jasenovac camp during the nazi holocaust years this was persistently used on serbs jews and roma gypsies … men women and children … to crush their heads and other body parts to avoid gassing or shooting them