At seven p.m. sharp, seven nights a week, during the darkest days of apartheid, an incendiary radio broadcast beamed out from Lusaka, Zambia. It began with the clack of machine-gun fire, followed by a familiar call-and-response:
Amandla Ngawethu!
“Power to the People!”
The shooting faded in and out, waxing and waning with the chant.

