National Union of Metalworkers of South Africa (NUMSA) and Others v Mahle Behr SA (Pty) Ltd and Another; National Union of Metalworkers of South Africa (NUMSA) and Others v Foskor (Pty) Ltd and Another (DA08/2019; DA09/2019) [2020] ZALAC 30; (2020) 41 ILJ 2093 (LAC) (8 June 2020)