In a capitalist system people who work hard are rewarded. why do socialists criticize this approach

Because they want everyone to have equal pay no matter what they do.

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.

Is this a joke question or what, obviously that means red dead redemption 2!