Answer:
to protest the system of apartheid
Step-by-step explanation:
The Apartheid was a system of institutionalized racial segregation that existed in South Africa from 1948 until the early 1990s. It was repulsed by the whole world because it was considered an authoritarian political decision that encouraged state repression of non whites by the nation's minority white population. To protest this terrible happening, the congress imposed economic sanctions on South Africa.