Who is responsible for the most deaths?

The answer is Traffic Accidents, or if you talking about specific persons look back to history of the second WWII about communism and Nazism i think take the credit for that.(Personally i do not support non of those two ideologies so please do not post stupid comments) thank you

As for persons directly responsible for deaths... it wasn't Hitler or WWII... Hitler killed around 6million... Stalin - 29, but Mao... 50... so theirs your answer.