The International Alliance of Theatrical Stage Employees, or IATSE (full name: International Alliance of Theatrical Stage Employees, Moving Picture Technicians, Artists and Allied Crafts of the United States, Its Territories and Canada), is a labor union representing over 140,000 technicians, artisans and craftspersons in the entertainment industry, including live theatre, motion picture and television production, and trade shows. https://www.iatse.net/