(Disclaimer: I found this on the intertubz. I disagree with the claim that "trump is more evil than this guy." Trump has NOT killed his own citizens...yet. Although the purging of vital government services may end up doing so.)
"Between 1936 and 1938, Stalin eliminated his political opponents and those he considered "enemies of the working class". This purge gave him complete control of the government and the party. Some historians believe that the death toll was around 20 million.