Ovamboland People's Organization

The Ovamboland People's Organization (OPO) was a nationalist organization that existed in 1959 and 1960 in South West Africa (present day Namibia). The aim of the organization was to end the South African colonial administration, and the placement of South West Africa under the United Nations Trusteeship system.

Source: Wikipedia — Ovamboland People's Organization (CC BY-SA 4.0)