National Union of Metalworkers of South Africa obo M Fohlisa and Others v Hendor Mining Supplies (a division of Marschalk Beleggings (Pty) Ltd) (CCT04/16) [2017] ZACC 9; [2017] 6 BLLR 539 (CC); 2017 (7) BCLR 851 (CC); (2017) 38 ILJ 1560 (CC) (30 March 2017)