electoralism

Well you always gotta keep in mind that if these countries tried to fully implement the ideologically pure version of Marxism, which was (with some caveats) the approach the Soviets chose early on, they'd be under siege and not at all in ideal conditions for building socialism. Marx and Engels believed that it would be the Western European countries where capitalism had advanced the furthest to be the ones to have socialist revolutions, but the opposite became true.