Steel Workers Union ('SWU') and Steel Employees Association ('SEA') both have members within Pretoria Steel Manufacturers ('PSM'). SEA is the majority trade union within PSM and has concluded a collective agreement with PSM which states that all employees within the company will use a clocking system and will work overtime on Saturdays. SWU argues that this agreement is not applicable to its members, as it (SWU) was not part of the agreement and it would therefore be unlawful to enforce the agreement to its membership. PSM and SEA argue that, the agreement binds all employees within PSM. Advise SWU on whether the agreement can lawfully be applied to its members as well. Substantiate your