The most comprehensive image search on the web.
Apparently so is the red M&M.
Take a Valium.
It doesn’t “prove” squat.
Look up Shepard Fairey, who is the artist who designed the works to which you refer.
He does admit that his artwork is inspired by Soviet propaganda artwork.
Although, just to make a point, I’ll agree that 0 is a socialist in the mold of Saul Alinsky.
However, posters and artwork prove nothing.
Words, long-term associations and philosophical statements do.
And we’ve got him dead to rights on all three.