I can think of more people getting killed by leftists.
Leftists
Nazis Germany-30 million
Soviet Union-80 million
Khmer Rouge-3 million
Maoist China-60 million
Baathist Iraq-3 million
Ustashis-2 million
Peronism-+10,000
Osama bin Laden-10,000 to 25,000 (Including Iraq and Middle East)
Che Guevara-10,000
Jim Jones-914
Charles Manson-40
Ted Bundy-35 to +100
Seung-Hui Cho-32
Jeffrey Dahmer-17
Eric Harris/Dylan Klebold-13