A lot more people actually died during the Holocaust than 6 million. See https://encyclopedia.ushmm.org/content/en/article/documenting-numbers-of-victims-of-the-holocaust-and-nazi-persecution
Mao and Stalin did kill a lot of people, but keep in mind that a lot of that was due to famine and incompetence, not outright extermination like the Holocaust
Nazi work camps and concentration camps starved plenty of people to death. Not just Jews but Communists, Gypsies, prisoners of war, political dissidents, Jehovah's Witnesses, homosexuals, etc. were worked and starved to death.
Since Ukrainians are the "victims of the year," perhaps you should look into the Holodomor. Or the Soviet Gulags. Or the "Great Leap Forward." Or the Tiananmen Square massacre. Or the Khmer Rouge. Or literally any other communist and socialist regime. Take your pick.
Also, why are you defending communism? And don't say "WeLL i"M nOt dEFenDiNg iT" because you certainly are. "Making excuses for" is the same as "defending" something.