Every time I see numbers like these, they are lower. China, for example, killed over 70 million by starvation caused by it's Great Leap Forward, and that doesn't include the millions killed in the bro...
The best estimate I saw on China was after they opened some library up years ago. That was 65m. The Nazis very hard but it's can only find 6m as coming from essentially thin air. Red cross is best real estimate and they had Jews killed at 250,00 but as you say, "undesirables" who knows