According to conflict theory, how can prejudice be used to create a split-labor

Conflict theorists stress that the dominant classes use competition between groups in society to create prejudice, which results in fear and distrust between the groups. The ruling classes, by exploiting this racial struggle, create a split-labor market divided along racial, ethnic, and gender lines that reduces group solidarity among the workers. Unemployment helps to maintain this split-labor market as unemployment provides a reserve labor force. This reserve force can be hired when the economy is expanding and released when the economy contracts. Minority workers are perfect for the reserve labor force, for their presence is a constant threat to the white workers.