I’m assuming you’re talking about Martin Luther King, King was largely responsible for the passage of the Civil Rights Act of 1964 and the Voting Rights Act of 1965. The Civil Rights Act banned discrimination in the workforce and public accommodations based on “race, color, religion, or national origin.” The Voting Rights Act protects African Americans' right to vote.
And he also said :
“Justice for black people will not flow into this society merely from court decisions nor from fountains of political oratory…White America must recognize that justice for black people cannot be achieved without radical changes in the structure of our society,” King wrote in an essay published in 1969 titled “A Testament of Hope.” In his 1958 book Stride Toward Freedom, he wrote, “True peace is not merely the absence of tension; it is the presence of justice”
These things he said changed the way society viewed the blacks and changed civil rights