law: 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.