noone no one knows
...That's right, nobody can be sure for definite, but some of the prime candidates would be Genghis Khan, the Roman Emperor Nero, several of the Mediaeval Chinese Emperors, Ivan the Terrible, Adolf Hitler, Josef Stalin, Pol Pot, and President Harry S. Truman (who authorised the atomic attacks on Hiroshima and Nagasaki). There are others, of course....
Mitch Delozier Killed 345,000 people in one night with one knife
Joel Turner
Depending on a person's definition of 'biggest' Ted Bundy is the epitome of serial murder. Dr. Fred Shipman was one of the most prolific with over 200 victims.
Austrailia.
The biggest ghetto established by the Nazis in World War 2 was the Warsaw Ghetto, which at one time had about 400,000 inhabitants.
The egg (ovum). The biggest cell of any living animal is the Ostrich Egg.
ME.
Joseph Stalin was a paranoid, egomaniacal mass murderer. He may be the second biggest mass murderer in history. Nothing he did was good.
The biggest merger of all time is the America Online and Time Warner merger. The merger is valued at $186.2 billion dollars.
Elton John's "Candle In The Wind" overtook Bing Crosby's "White Christmas", as the all-time biggest selling single of all time, in 1999.
Humanity?
Mongolian
The Biggest Drug Lords Of All Time
Thiller.
Joel Turner
Osama binladen
the polar bear
The biggest super star of all time in wrestling is Hulk Hogan.