Section 42: Certain acts not actionable in tort if in contemplation or furtherance of trade dispute. (As Amended by Section 9 of the Trade Unions (Amendment) Act, 2005)

(1) An act done by a person in contemplation or furtherance of a trade dispute shall not be actionable in tort on anyone or more of the following grounds only, that is to say-
(a) No person shall subject any other person to any kind of constraint or restriction of this personal freedom in the course of persuasion;
(b) No trade union or registered Federation of Trade Unions or any member thereof shall in the course of any strike action compel any person who is not a member of its union to join any strike or in any manner whatsoever, prevent aircrafts from flying or obstruct public highways, institutions or premises of any kind of the purposes of giving effect to the strike."
(c)
that it consists in his threatening that a contract of employment (whether one to which he is a party or not) will be broken; or
(d) that it consists in his threatening that he will induce some other person to break a contract of employment to which that other person is a party.
(2) Nothing in subsection (1) of this section shall prevent an act done in contemplation or furtherance of a trade dispute from being actionable in tort on any ground not mentioned in that subsection.