Poc, mainly black, used sit ins at cafes that they were refused service at.
Whites would attack, spit at, dump coffee on poc simply sitting there and it would get out in television.
Made more white people see an issue. Spread the word.
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Boycotts are incredibly helpful. Bus boycott after Rosa parks. Poc used the busses more than whites. After Rosa parks blacks refused to ride the busses. Put a dent in the busses money.