Thanks for the Hugo Gellert link. That's a great pick. After wondering around I found this:
http://www.loc.gov/exhibits/goldstein/goldcap.html
It's an on-line exhibit by the Library of Congress. Caution. Actual American communist artists depicted. Thank god the US Congress doesn't know the LOC is teaching kids communism.
Here is a teaser, called Lunch Hour, shit almighty yes:
http://www.loc.gov/exhibits/goldstein/25.jpg
CG