The 25 Most Ruthless Leaders Of All Time

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One man's hero is another man's tyrant, a popular aphorism goes. But while we can argue the validity and virtue of certain political agendas, the callous methods by which some leaders attain their goals are less up to interpretation.

Here's a list of the most ruthless leaders of all time featuring men and women who employed merciless tactics to achieve their political and military agendas.