#1 Adolf Hitler
There were so many vicious rulers that you can certainly make some changes to this list, but one thing is for sure – Adolf Hitler will remain in the first place. This German politician was the dictator of the Nazi Germany and responsible for starting the World War II in 1939 when he invaded Poland. He wanted to create a higher white race and hated and killed anyone that didn’t fulfill these requirements. Hitler is responsible for killing 6 million Jews, which is known as the Holocaust. In total, it is thought that his ruling led to around 20 million people getting killed, including prisoners of war and civilians. He refused to surrender and committed suicide by biting a cyanide capsule and shooting himself simultaneously.