Mark mentions that "no one seemed to notice" when Ms Hagen passed away, but I don't think the date of her demise is mentioned yet anywhere in this thread. How long has it been that we failed to notice?
Back in the late 60s, before we met, my wife Peggy studied acting for a year or two at HB Studios in New York, which was Uta Hagen's school (she was the "H" in "HB"). When I first learned about this, in 1972, the name of Uta Hagen was only vaguely familiar to me, as an actress from a former time. If I'm too young at age 56 to really remember Uta Hagen as an actress, it's not surprising that her name has been largely forgotten by the general public (most of whom are younger than me).
Since she avoided acting in films, and thus lost any chance to create a relatively permanent record of her performances, she has been largely forgotten by now among all but the most fervent followers of the Broadway stage. It is of course unfortunate that she got caught up in the McCarthy-era blacklist, which undoubtedly prevented her from maintaining her fame and celebrity at a time when she should have been in her prime. However, with no cinematic record available for viewing on late-night TV, etc., it would still be difficult to maintain her memory even were it not for the political complications.