Who are 3 totalitarian dictators?

Hitler leads the way. Pol Pot, the current bunch of nutters in Burma (Myanmar), the divisions in Africa at the moment, or in Rwanda in recent times... Take your pick

Another answer:If you simply go by body count, the top three, without a doubt, are:

• Adolf Hitler
• Joseph Stalin
• Mao Tse-Tung

Each of them is probably responsible for 20 million deaths or more. Nobody else comes close. Pol Pot, with only 1.5 million, doesn't make the same league. He's got plenty of company, including Kim Jong-Il, Enver Pasha, Czar Nicholas II, and several others in the million+ club.
Adolf Hitler

Mussolini

Joseph Stalin