The L.A. Times archive folks dug up a 1959 article about a man named Louis Pollock. Pollock was a screenwriter who was blacklisted in 1954 not because of any political activities on his part — that would have been bad enough — but because some folks had him confused with a storeowner named Louis Pollack. Pollack (the storeowner) refused to testify before the House Un-American Activities Committee and the mix-up seems to have harmed the career of Pollock (the writer).
It would be a nice ending to this tale if, after the confusion was cleared up, the career of the writer Pollock had flourished. But a check on his IMDB listing does not list a whole lotta work after things were cleared up. It only lists one 1985 job on Alfred Hitchcock Presents, which was quite a coup for Mr. Pollock when you consider that he passed away in 1964.
I couldn't help noticing that IMDB lists him as having been an uncredited writer on Lady and the Tramp. Since that movie came out in June of '55, it's possible — though I should think unlikely from the timing — that Pollock did whatever he did on it after he was blacklisted. Mr. Disney, despite all the tales of his right-wing politics, was willing to surreptitiously employ blacklisted writers. As I explained here, my old neighbors Al and Helen Levitt worked on several scripts for Walt during the period when they were effectively barred from writing under their own names. You'll notice that in that piece I wrote, I mentioned that one of the points they made about the blacklist was how sloppy its enforcement was, often confusing one person with another and blacklisting the wrong guy. Well, now here's Louis Pollock as a perfect example of that.