Where did marx ever advocate for slavery?
I'd be interested to know too. Slavery as it existed during Marx's day (such as in the
American South prior to the Civil War) was something he was very much opposed to.
I'm no expert on Marx, though, who wrote an insane amount of content...so maybe there is something in there somewhere where he advocated for slavery, I dunno. Personally I don't see that much of a connection between Marxism and Nazism...you could point to certain
documents that Marx wrote and make the argument (as some have convincingly done) that you can see anti-semitism in them, despite the fact that Marx was of Jewish descent himself...or look at some of the commentaries from Engels, who referred to the Slavs as "rats" or whatever...but those are kind of superficial things IMO. The foundations of Marxism were internationalism and a materialist philosophy, while Nazism was centered around nationalism and a mystical-vitalist philosophy...even the "socialist" wing of the Nazi movement, like the Strasser brothers etc, violently condemned "Jewish" materialism.
Or perhaps you could make the argument that all these dudes, Hitler, Lenin, whoever else you want to name, all they wanted was power, power by any means etc, and that's the common thread. But that kind of renders any kind of political judgement or analysis pointless. (That's kind of what Foucault and the later post-modernists argued right, that politics, ideology etc. were all merely linguistic means to obscure the way that "power" functions in society?)
In regards to Hitler and the Nazis specifically, one element that they did borrow from the socialist/Marxist left quite successfully was the embrace of mass politics, and some of the grassroots ways of organizing the masses that had previously been the purview almost exclusively of the left. That was a brilliant innovation of fascism IMO...previous reactionary movements were extremely elitist and had tried to keep the masses as far away as they possibly could.
You could also argue, as some conservative historians do, that the link between the French Revolution, Lenin and the Bolsheviks, Hitler and the Nazis etc is an embrace of mass politics combined with an obsession (originating in enlightenment philosophy of the 17th and 18th centuries) with "perfecting" humanity which (according to them) inevitably leads to totalitarianism and genocide.
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Rant over lol. I love those galvanizing 19th/20th century ideologies like Marxism, fascism, nationalism etc...so interesting!

:D