Concept:The 1973 United Nations resolution officially classified the apartheid system in South Africa as an international crime.Explanation:Apartheid was a government-enforced policy of racial segregation and discrimination in South Africa.In 1973, the UN General Assembly adopted a resolution that condemned this policy.The resolution declared that apartheid violates fundamental human rights.It was therefore formally described as a crime against humanity.This status allowed the international community to take stronger action against the system.Answer:Crime against humanity.