<u>A classifying citizens into four main racial groups.
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Explanation:
The government divided all citizens under the Population Registration Act (1950) into four racial categories: Africans, Malays, Indians and Caucasians. This division served as the basis of apartheid. New laws were also passed to ban sexual relations and marriage between people of different races. Authorities went to such an extreme that they dismantled existing mixed families. During the Grouped Areas Act, also from the 1950s, multiracial aboriginal territories, such as Sophia Town in Johannesburg and Area Six in Cape Town, were subjected to constant terror so that their populations would soon moved out.
