The International Alliance of Theatrical Stage Employees is the largest union representing workers in the entertainment indus ... try in The United States and Canada. Our members work in all forms of live theater, motion picture production, television production, television broadcasting, trade shows, exhibitions, and concerts, as well as the equipment and construction shops that support all these areas of the entertainment industry. We represent virtually all the behind-the-scenes workers in crafts ranging from motion picture animation to theater ushering. read more