The Library of Congress has the Proquest database, but when I looked on Saturday, I could not find anything there. I wonder if there is a release date some time in the future, or if they are asking libraries to pay more to expand the database.
H-Hoac is the H-Net network for Historians of American Communism.
I have access via Wayne State, but the "Historical Newspapers" section of Proquest doesn't show any results when I type in "Communist Historical Newspaper Collection"
I think you just have to find an institution who subscribes to the ProQuest database -- such as Princeton University Library or Baylor University
Do you know where on Proquest? I have been searching for a while and cannot find where on their database the newspapers are located. I can find the American Communist Party papers, but not CPUSA.