[The Conversation Africa] One August night in 1967 in the village of Mungo in central Angola, the local colonial administrator walked into a bar to buy cigarettes. As he entered, he noticed furtive gestures. The barman, Timoteo Chingualulo, turned down the volume on the radio and Chigualulo's friend, António Francisco da Silva "Baião," a nurse at the health delegation, changed the station.