Adjunct faculty members at Bentley University in Massachusetts voted to form a union affiliated with Service Employees International Union following an earlier, narrow vote against unionization, they announced Thursday. Adjuncts approved the bid by a 2-to-1 margin; their new bargaining unit of 220 adjuncts joins four other SEIU part-time-faculty unions in the Boston area: those at Boston, Lesley, Northeastern and Tufts universities. (Note: This sentence has been updated from an earlier version to include Boston University.) Organizers at Bentley attributed their about-face since the last Bentley union vote in 2013 in part to seeing adjuncts on other campuses form unions and, in the case of Tufts, gain wins in their contract. Bentley released a statement about the vote saying that while it “consistently stated its belief that having a union is not in the best interest of the faculty or the university, the university will, of course, bargain in good faith over the terms and conditions of employment for unit members."