If you want to get a far-left Democrat, socialist or communist really angry, tell them that Fascism and National Socialism are offshoots of the socialist movement. When you look at the socialist system, they are.
Back in the 1920s Mussolini can up with the idea that socialism might be a better sell to the people if you linked it was nationalism. In that way Fascism was born. Hitler had a similar idea when he came up with the National Socialist Party or Nazi Party. He pulled people in by praising the virtues of “the father land” and went further when he extolled the idea of the “superior Arian race.”
The political and economic systems were very similar. The state controls the economy and forces everyone into a “beehive” economic system. Decent and discussions about the issues of the day are severely limited or totally suppressed. To the average citizen there no difference between communism, fascism and socialism. The state controls you.
You should have seen the reaction from the main communist who posts on a political site to which I belong. He the Internet equivalent of a “Donald Duck meltdown.” He had charts that showed how the Communists and Fascists were on totally politically opposite sides. Then he went into a long rant about how stupid I am.
You know you have hit the nail on the head when you force a rat into a corner. He screams and bites, but it the end argument is over. From the human rights and economic perspectives, Communism and Fascism are two sides of the same coin. The only reason for any perceived difference is that Stalin can running to us to save his stinking hide after Hitler broke their non-aggression pact in 1941.
From the historical perspective it’s hard to tell which tyrant was worse for mankind, Stalin or Hitler. Stalin actually killed more innocent people than Hitler did, but he had longer to do it, and he didn’t bother with gas chambers and cremation. Stalin preferred firing squads and ditches for the bodies, starvation and death from exposure, and concentration camps where he worked people to death. Even Khrushchev recognized Stalin’s cruelty and owned up to it in 1956.