I want to know the answer to the following question:
Who believed that action needed to be taken to level out the social and economic playing field before natural selection could occur to improve humanity?
All the background I'm provided with is that "Darwin objected to his ideas being used to justify military aggression and unethical business practices as he believed morality was part of fitness in humans, and he opposed polygenism, the idea that human races were fundamentally distinct and did not share a recent common ancestry.". Is that enough to answer the question?