hiring hall

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A union-operated placement center where jobs from various employers are allotted to registered applicants according to a set order based usually on rotation or seniority.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An organization which has the responsibility of furnishing new recruits for employers who have a collective bargaining agreement with the trade union.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a union-operated placement office where jobs are allotted to applicants according to seniority or rotation