Now part of the United Steelworkers.
"Out of a total of 2,203 faculty members who voted in the election, according to the document, 1,511 voted to form the union, while 612 voted against it. There are 80 challenged ballots, which isn’t enough to affect the outcome of the election. Roughly 3,000 faculty were eligible to vote in the election."
https://www.post-gazette.com/news/education/2021/10/19/Pitt-faculty-vote-to-unionize-in-landslide-election-United-steelworkers/stories/202110190153
https://www.wesa.fm/education/2021-10-19/pitt-faculty-votes-to-join-united-steelworkers-union
https://pittnews.com/article/167927/featured/pitt-faculty-vote-to-form-union-by-wide-margin/