I suppose, the scale to which Stalin's repressions were exaggerated in the West and still are by some to this day is ridiculous and so i think fits the question in some way. I mean, I've heard quite a few time people claim that Stalin killed 100 million, 50 million or the most common one - he killed more people than Hitler. Wow, so Stalin killed around 35 million people or more ( close to 40 probably). Since, such people forget that not only Jews suffered because of Nazis. USSR alone lost 25 million people or more. There is not enough or vey little representation of all atrocities that Nazis committed in Soviet Union and how they systematically exterminated Slavic population and enslaved it, with more than 13 million civilians dead. However, you will always hear about mass rapes in Berlin on the other hand and Hollywood is filled with movies about Holocaust, but not any about what Slavic population suffered on occupied territory. ( if there are, all of them were made in Soviet Union )
Hitler took to the extreme what had always been done, like killing Jews and Gypsys. Stalin may not have killed that many, but he wiped out 80+% of the political and military leadership, and a large portion of writers and artists and so on. Kings and dictators had always been killing people who were a threat to them at court and those openly opposed to their political and religious policies. Stalin took it further and killed anyone who might be a threat or might be disloyal or in opposition.