People do good things and bad things in life. leading for some marvelous positive contributions and absolutely no positive contributions in the history of humanity. Here is the list of 10 worst men in the history of human kind. These men carried some barbarian acts of killing mass population. Some were the great leaders, some cult leaders, some terrorist. All of them had one thing in common the gruesome act of killing innocent people. One may argue that each one of them suffered from some mental illness but what they did has absolutely not theory that would prove this right. A disclaimer – This may not be for the weak heart people. Watch at your own risk!