Who is the most dangerous killer in world?

There is no definitive answer to this question as it depends on a number of factors, including the definition of "dangerous" and the time frame being considered. However, some of the most dangerous killers in history include:

* Josef Stalin: The Soviet dictator is estimated to have been responsible for the deaths of millions of people, both through executions and through forced labour camps.

* Mao Zedong: The Chinese leader is estimated to have been responsible for the deaths of tens of millions of people, through a combination of famine, executions, and political purges.

* Adolph Hitler: The German dictator is estimated to have been responsible for the deaths of millions of people, through the Holocaust, the Second World War, and other atrocities.

* Pol Pot: The Cambodian dictator is estimated to have been responsible for the deaths of millions of people, through a combination of starvation, executions, and forced labour.

* Idi Amin: The Ugandan dictator is estimated to have been responsible for the deaths of hundreds of thousands of people, through executions, political purges, and other atrocities.

These are just a few examples of some of the most dangerous killers in history. It is important to remember that these individuals are not representative of all people from their respective countries or cultures.