Yes, he was Stalin's little helper.
He also did more than any other propagandist to set up the cry of "McCarthyism," which has been one of the left's most useful tools for the past 50 years, until Anne Coulter finally drove a stake through its heart (we hope).
Plus, as I said on the early threads, he was a second-rate playwright.
I read Death of a Salesman in college. I was underwhelmed despite the prof's vociferous insistance that it was good stuff.