While I have met a few Catholics who pine for Tradition circa pre-VaticanII, I have yet to run into the anti-Semitic version personally. I hear a Lot about them, though.
They are represented by a publication called "The Remnant" which seems like it's 'Traditional' but is really almost subversively 'murky-traditional'. They have printed some anti-Jewish (cabal conspiracy theory, Jews taking over the world stuff) that is uncharitable at best. At first it seemed like a nice advocate for the Old Mass, etc, but I finally had to cancel my subscribtion when I realized how reactionary and paranoid their position really is. It uses just the same sort of logic that this article indicates some individuals still fall prey to.