Fearless was a completely different guy. As you note.
BTW, in only relatively recent years it came out that Sinclair knew that Sacco and Vanzetti were guilty from their lawyer but chose to write an exoneration of them because it would sell well with his Leftist readers in Europe.
So much for America’s “truth teller”!
Robert W. Welch Jr was right.
https://www.americanthinker.com/articles/2020/06/the_floyd_riots_mark_a_century_of_communist_agitation.html
I copied the link from FR a coupla years ago.
It's so good, I re-post it now & then.