You might also be able to see the connections with policies of social mixing between the social classes which lay behind much educational policy of the 1960s. There are familiar criticisms of the functionalist approach. Labour markets still do differentiate according to 'race'. Low wages led to poor housing conditions, concentration in urban areas, reduced opportunities, and, we might add, low status images for black people. We said that race is a complex issue.
All perspectives can help cast some light on the issue.
Weberian Approaches Castles and Kosack cited above are marxists, and we shall return to marxism at the end. But it is already clear that racial discrimination has a number of social dimensions. Labour markets inevitably link with other social and political goods in their 'distributive' markets too. Immigrants especially face multiple discriminations. We do not have to insist that economic factors are somehow more fundamental than the rest.