Respectfully, I'd like to correct you on this, so that people who don't know and don't check don't get this wrong. You probably meant the other way around.Alas, the Russian Communist regimes killed over five times more people than the German National Socialists.
While the sources can be further checked the Wikipedia shows 50-56 million deaths directly caused by WW2. https://en.wikipedia.org/wiki/World_War_II_casualties
And "Several scholars, among them Stalin biographer Simon Sebag Montefiore, former Politburo member Alexander Nikolaevich Yakovlev and the director of Yale's "Annals of Communism" series Jonathan Brent, put the death toll at about 20 million." for the Soviet Union Communist regime. https://en.wikipedia.org/wiki/Mass_killings_under_communist_regimes#Soviet_Union