The National Labor Relations Board administered elections yesterday for graduate students in nine departments.
Students from the departments of English, geology and geophysics, history, history of art, math, and sociology voted in favour of unionisation, organisers said. Students in the physics department voted against it. In the departments of East Asian languages and political science, a majority went for unionisation, but ballots were still to be counted.
"This moment has been decades in the making," said Local 33-UNITE HERE chairman Aaron Greenberg, a graduate student in political science. "Tonight is a tremendous victory and an opportunity for all of us to come together and work to address the issues we face."
Local 33-UNITE HERE had the NLRB's approval to hold elections for individual departments, despite objections from the university.
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Yale Graduate School Dean Lynn Cooley said the results reflect divisions among graduate students, noting the union lost in one of its hand-picked departments.
"The slim margins of victory and very low vote counts in many departments only underscore the concerns many have voiced that a small number of students could be in the position to decide such an important question for everyone," she said.