All of these are bad and confusing. This is a simple article intended for the simple reader. I will suggest:
Mass killing on the scale of millions (possibly billions) of people occurred in communist and socialist countries. The highest death tolls occured in Russia and Red China. The Reds deliberately killed millions using guns, knives, bayonets, poison gases, artillery shells. The lion's share was caused by inaccessible and inadequate socialized medicine, land reform, tort reform. These mass killings are known as the Red Holocaust, mirroring the Holocaust in Nazi Germany. 24.146.224.106