is The International Alliance of Theatrical Stage Employees, Moving
Picture Technicians, Artists and Allied Crafts of the United States
and Canada, AFL-CIO, CLC.
For more info browse
IATSE's Local #22 - website.
The National Theatre's supporting chapter is IATSE Local # 22, 1810
Hamlin Street, N.E., Washington, DC 20018
and the office phone number is 202-269-0212