The irony is that Hitler was a boy scout compared to the lefty communist and socialists in history. 120-160 million dead, depending on who you believe, not counting the dead infants killed because they were girls or someone wanted an abortion and they were thrilled to “help out.”
Their numbers killed were higher...but that was because they mostly were in power longer than Hitler. No one ever made a “boy scout” out of Hitler...the Holocaust alone stands out in the annals of history for it’s nightmarish thoroughness and endless cruelty...it was unique even amongst other genocidal crimes.