I read 'Mid-Century' before I read his USA trilogy, and was astounded to find him such a commie! lol!
Orwell was a more subtle man than you credit him, imo.
He saw through the commie hoax before his comrades - give him that.
I was forced to read ALL of the books you mentioned and it was a VERY painful episode in my education.The teacher was MAD for dos Passos;damned near genuflected every time she said his name.YUCK!