How can republicans lie about democrats being the same as nazis when the nazis persecuted the communists in Nazi germany?

Nazi Persecution of Soviet Prisoners of War Holocaust Encyclopedia (ushmm. org)

"Yet for Nazi Germany this attack was not an "ordinary" military operation. The war against the Soviet Union was a war of annihilation between German fascism and Soviet communism; a racial war between German "Aryans" and subhuman Slavs and Jews. From the very beginning this war of annihilation against the Soviet Union included the killing of prisoners of war (POWs) on a massive scale. In part, German officials excused their ill treatment and murder of Soviet POWs by pointing out that the Soviet Union was not a signatory to the Geneva Convention and its soldiers did not warrant the protection that the convention extended to prisoners of war."

How can republicans lie about democrats being the same as nazis when the nazis persecuted the communists in Nazi germany?
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