Welcome to IATSE Local 339's Home on the Web. Local 339 is the Great Falls and Surrounding area local of the International Alliance of Theatrical Stage Employees, Moving Picture Technicians, Artists and Allied Crafts of the United States, its territories and Canada. AFL-CIO, CLC For more than 100 years IATSE Local 339 has provided professional staging services to the Great Falls and surrounding areas entertainment, convention, and trade show industries. Our highly trained members work at venues like The Mansfield Center for the performing Arts, Montana Expo Park, and Centene Stadium. We have a wealth of experience in set construction, sound systems and lighting requirements of all specifications.