law: Trade Union Act, 1926 
  18. Immunity from civil suit in certain cases 
  (1) No suit or other legal proceeding shall be maintainable in
  
  any civil court against any registered trade union or any 8[office-bearer]
  
  or member thereof in respect of any act done in contemplation or furtherance of
  
  a trade dispute to which a member of the trade union is a party on the ground
  
  only that such act induces some other person to break a contract of employment,
  
  or that it is in interference with the trade, business or employment of some
  
  other person or with the right of some other person to dispose of his capital
  
  or of his labor as he wills.
  (2) A registered trade union shall not be liable in any suit or
  
  other legal proceeding in any civil court in respect of any tortious act done
  
  in contemplation or furtherance of a trade dispute by an agent of the trade
  
  union if it is proved that such person acted without the knowledge of, or
  
  contrary to express instructions given by, the executive of the trade union.