Trade Union Act, 1926
19. Enforceability of agreements
Notwithstanding anything contained in any other law for the time
being in force, an agreement between the members of a registered trade union
shall not be void or voidable merely by reason of the fact that any of the
objects of the agreement are in restraint of trade:
PROVIDED that nothing in this section shall enable any
civil court to entertain any legal proceeding instituted for the express
purpose of enforcing or recovering damages for the breach of any agreement
concerning the conditions on which any members of a trade union shall or shall
not sell their goods transact business, work, employ or be employed.