The Intl. Alliance of Theatrical Stage Employes has unionized the projectionists for the Toronto International Film Festival.IATSE Local 173 announced Monday it had won a representation vote by a 22-6 margin following legal challenges from the festival. The vote certifies the local as bargaining agent for all festival projectionists. The festival, which began in 1976, currently operates with a $12 million budget, 70 full-time staff, 500 part-time and seasonal staff, and 1,700 volunteers. The org is scheduled to open its own building in Toronto’s theatre district in 2008.