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: Nelson Pill Hearings
38:25

Behind the Scenes Minis: Alaska and Contraceptives
28:17

The IUD: A History
44:41