On August 9, 1956, De Bruyn led the march of 20 000 women to the Union Buildings of Pretoria along with Lilian Ngoyi, Albertina Sisulu, and Helen Joseph to protest the requirement that women carry pass books as part of the pass laws.
Ka 9 Phatwe 1956 Albertina Sisulu o ne a golagana le 20 000 ya balwela-kgololesego ba bangwe ba basadi jaaka Helen Joseph le Sophia Williams-De Bruyn mo mogwantong go ya kwa Union Buildings kwa Pretoria ka ditshupetso tsa melao ya dibukana tsa boiketsesi.