There's plenty of rich racist people and wealthy black people still see racism from colleagues. Economics would do a lot, but they cannot solve everything.

It's also worth noting that the New Deal disproportionately helped white people and had policies which made institutional racism worse. As you point out with hurting organized labor, it really didn't do as much help as we think it did.

It is not enough to simply call for fixes to economic inequity. We need to be holistic. We gain nothing through economic reductionism.