Hmmmm, let's see....
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1. Fascism/Nazis/WWII/Hitler etc.
2. European colonisation of empire e.g. in Africa, India, etc.
3. Catholic religious zealotry e.g. in the New World and especially Latin America
4. Religious cults, brainwashing e.g. Peoples Temple/Jonestown, siege in Waco etc.
5. Pharmaceutical corporations (refusing life-saving drugs to countries in Africa)
6. Defence corporations/arms industry (exacerbating wars overseas)
7. Zionism (Israeli wars in Lebanon, Gaza Strip, West Bank) MANY more die at Israel's hands than vice versa
8. Private health corporations e.g. in U.S. (the poor who can't afford treatment are left to die)
9. Gun-rampaging nutcases and psychos especially in the U.S.
10. Bringing of 'western' diseases (whether accidental or deliberate) to indigenous tribes and peoples
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That took me quite a while to think about, and type. I hope there's a prize.
(by the way - I delight in being extremely politically incorrect)