If you're genuinely open to this conversation - the Soviet Union funded many of the world's labor movements, giving it varying amounts of influence on them. Influence which it sometimes used to spread talking points of its own choice and to its benefit. Democratic Socialists of America was born from a branch of one of these movements. This is more visible looking at DSA's foreign policy platform, where today they use virtually identical talking points to those the Soviet Union distributed to their partners back in the 60s and 70s.

I don't know if a purely organic and independent socialist movement could have existed, but in this world, the movements with the means and resources to get their voices heard are going to be the ones who inherited resources and networks from their predecessors.