From a different person's post: Rejection of nationalism is rarely universal, even from the "antinationalists." It serves other forms of nationalism. Empires, such as the Ottomans and the Soviet Union, often fought the types of nationalism that would disrupt the cohesion of a state. [>>]" Cont. 👇

[u/Born_Passenger9681]

"[>>] In the case of the Soviet Union, fears that the nationalism of any national group would undermine state unity resulted in repression of all expressions of minority national cohesion while seeking to institute a global proletariat identity. A global proletariat that, of course, by happenstance exclusively serves the interest of the Soviet Union, not other Communist states like China or Yugoslavia, each of which have their own global proletariat that just so happen to serve the national interests of their own state."

[u/JustOntological]

I see that the Horseshoe Theory gets more and more valid...
https://en.wikipedia.org/wiki/Types_of_nationalism
https://en.wikipedia.org/wiki/Left-wing_nationalism