Benito Mussolini and his Nazi Germany's anarchy are known across the globe. Remember the famous Holocaust that caused the lives of around 4 million people (some people speculate the figure was closer 11 million). The swastika symbol of Nazi Germany is one of the most hated symbols in human history.
One of the most brutal and right conscious tribes of America, Apache tribe is among the best knife fighters the world has ever seen. They used weapons made of bones with which they slit away the throat of their enemies
Whether it is the physical strength or the techniques of war, these groups of seafaring northern Germanic people terrorized the core areas of north Atlantic islands, Asia and a significant part of Europe. They used to believe that they are born to sacrifice their life at war field.
Claimed to be the first settlers of New Zealand even before the arrival of Europeans, Maoris can be called as truly ferocious and cruel. They practiced cannibalism in war field so much so that in 1809 they killed 66 European people who were in a boat attacked by them. Not just they killed them but they took them to the shore and ate them.
The Aztec were ethnic groups of central Mexico, arrived in Mesoamerica around the beginning of the 13th century. These Cannibals used to believe that with the passing of every 52 years, the world would end unless the Gods were strong enough. To make the Gods, human sacrifice was very much necessary. So, they took a human atop a pyramid and used to take out the pumping heart breaking the ribs. To make the scene more horrible they would throw away the body downstairs.