The correct answer to this open question is the following.
Martin Luther King Jr. was the great African American leader that supported the civil rights movement in the middle of the 1950s and part of the 1960s. He used Gandhi's protest style of non-violent actions.
During the Montgomery. Alabama Bus Boycott in 1955, he led the boycott against the buses that served the city of Montgomery because the company did not allow African Americans to sit at the front seats of the bus. People supported the protest and the boycott was successful.