How many is , "many liberals" since liberalism and communism are not compatible? Your bigoted fantasies of character assassination ruins the scholarly form you use.It is often overlooked or ignored, at least by many liberal historians, that Stalin murdered over 1 million Jews (approximately 1.3 million), in addition to persecuting them (LINK, LINK, LINK. LINK).
Except for a tiny number of far-left Stalin apologists in the West, Stalin's mass murders and other brutality are universally acknowledged by Western scholars. However, Stalin's murder of over 1 million Jews is not highlighted nearly as much as Hitler's murder of 5-6 million Jews.
To put this into better perspective, this means that Stalin was the second-biggest murderer of Jews in European history, second only to Hitler.
We should also remember that following the signing of the Molotov–Ribbentrop pact between Germany and the Soviet Union in 1939, Stalin promised the Nazis that he would rid the Soviet Union of "Jewish domination" and ordered the purge of Jewish employees in government ministries, universities, the military, and other major institutions. This was accompanied by increased violence and discrimination against Soviet Jews.
Moreover, shortly before he died, Stalin was on the verge of launching a massive campaign of persecution and oppression against Soviet Jews that would have resulted in mass deportations and/or mass imprisonment in concentration camps, if not worse. This fact has been discussed by many scholars, such as Alexander Rashin's 2003 book Why Didn't Stalin Murder All the Jews and Louis Rapoport's 1990 book Stalin's War Against the Jews, and also in a few documentaries (see also LINK).
Even today, Russia's brutal regime persecutes and smears Jews and even minimizes the Holocaust (LINK, LINK).