The International Alliance of Theatrical Stage Employees (IATSE) is a labor union representing workers in the entertainment industry, including those involved in theater, film, and television production. Founded in 1893, IATSE advocates for the rights and working conditions of its members, which include stagehands, technicians, and other behind-the-scenes professionals. IATSE plays a crucial role in negotiating contracts, ensuring fair wages, and providing training and safety standards for its members. The union is composed of various local unions across the United States and Canada, working together to support the workforce in the entertainment industry and promote solidarity among its members.