Stalin was a communist.
Communists put him in power.
Communism has lots of blood on its hands.
This is all known. And you can't change that.
The most well-known communists in the world, Lenin and Trotsky, threw themselves with all their might into preventing Stalin’s rise to power, that is, the replacement of the revolutionary working-class government ruling Soviet Russia with a counterrevolutionary bureaucratic clique. His rise to power was impossible until years of foreign invasion and civil war had weakened the workers’ dictatorship and until he and his allies had systematically rid the government and ruling party of every vestige of democracy and of communist leadership. His political approach was diametrically opposed to that of Lenin on core issue after core issue of communist principle.
And he still looks like a humanitarian compared with his capitalist contemporaries such as Hitler, Mussolini, Churchill, or Roosevelt.