“The Vanguard” as you describe it was an ideological justification to describe any and all criticism of the ruling class (and yes, to me, the upper echelons of the USSR were a ruling class) as counterrevolutionary. “The most advanced of the working class” shredded the countries military leader shit on the eve of the second world war not because of existing coups, but out of paranoia. “The vanguard” in the end served only to preserve their own interests.
“The people elected SRs or did not vote majority Bolshevik? What do they know, we are the vanguard, we know whats best, lets ignore the elections and abolish the soviets.”
Thats why i dislike the concept of the Vanguard. Because never turned out the way it was promised and it never will.
Painting the SRs or the dismantled soviets as bourgeois is a bit rich.
I know that the marxist framework does not explicitly say “The Vanguard is always right”, but for example in the GDR, the Vanguard itself said so. “Die Partei hat immer Recht.” The Party is always right.
And im going to be honest: If shit like the great terror is how marxist states are supposed to be, maybe they are shit states.