This 1956 march was a protest against pass laws that were part of South Africa’s system of apartheid – and specifically the requirement that women carry passes. The protest was simultaneously part of the anti-apartheid movement in South Africa, and the movement for women’s rights.
Research:

SYMHC Classics: Haymarket Riot
37:40

Behind the Scenes Minis: Serving Lip and Ethics
26:19

James Braid, Surgeon and Father of Hypnotism
43:36