I think you're forgetting the world's biggest oppressor....communism. Over 100 million killed and counting!
Oh, and if you're gonna use a quote, pal, at least use one where the author had the guts to sign his name. None of this 'Unknown Commentator' BS. That sounds like something a high school kid would say anyway.
And, since you like quotes so much, here's one for ya:
"Let us be perfectly honest. The historical record is indisputable. Marxism means the persecution of Christians, the execution of right wing dissidents, massive slave labor camps, and grinding poverty for countless millions of terrified, muzzled human beings."
--J.R. Nyquist
"You must make an example of these people. (1) Hang (I mean hang publicly, so that people see it) at least 100 kulaks, rich bastards, and known bloodsuckers....Yours, Lenin." --Order to Cheka (predecessor of the KGB)
"Excellent idea! That's exactly how I see it. Unfortunately, it wouldn't do to call it that." --Replying to his Commisar of Justice who asked: "What is the point of a People's Commissariat for Justice? ... It would be more honest to have a People's Commissariat for Social Extermination."