10 Most-Evil Nazis You’ve Never Even Heard Of

6. Josef Kramer (And Irma Grese) - "The Beast Of Belsen" (And "The Hyena Of Auschwitz")

Commandant of Bergen-Belsen concentration camp, Josef Kramer showed no mercy at all to his inmates - and neither did his sidekick Irma Grese. Labelled as "The Beast of Belsen", Kramer worked at Natzweiler-Struthof, Bergen-Belsen and Auschwitz camps, killing tens of thousands of prisoners via brutal and uncompromising methods. During his first role at Natzweiler-Struthof - the only Nazi camp constructed on modern-day French territory - he personally gassed 80 Jewish men and women, and then preserved their skeletons so they could be housed at the Anatomy Institute at the Reich University of Strasbourg.

In May 1944 Kramer was then put in charge of the gas chambers at Auschwitz, gleefully murdering thousands upon thousands of inmates on an industrial scale never before seen by mankind. He was then transferred to Bergen-Belsen in December 1944, where his rule became harsh and dictatorial - and he even remained when the British liberated the camp, taking them around for an inspection. Grese meanwhile first worked at Ravensbrück camp before transferring to Bergen-Belsen and then Auschwitz - and she was equally as brutal.

Known as "The Hyena of Auschwitz", she had a penchant for selecting both the sick and the weak and enjoyed watching them suffer. Known for her beauty, Grese had many SS lovers including Josef Mengele - and she illegally had an abortion while at Bergen-Belsen.

In their trials, both were found guilty of war crimes - with Kramer imprisoned at the Hamelin jail where he was hanged in December 1945 having shown no remorse for his actions, merely explaining he had been "following orders". Grese was also hanged in December 1945 in Hamelin Jail at the age of just 22, making her the youngest woman to die judicially under British law in the 20th Century.