Genuine question, here. Why do racists get their power from capitalism? Are there suggested readings on the topic?

I'm pretty sure that racism exists outside of capitalism also.

I'm going to need some explanation as to how capitalism is the primary source of power for racism, so much so that you cannot be anti-racist without being anti-capitalist also.

It's not that I disagree with the statement. It's that the statement takes a massive leap when it says "racism gets its power from capitalism", and I'm not able to follow.

I need a couple of steps between to fill the gap.