Jesse Jackson is a civil rights activist that has played and still plays an important role in such activism. He was not involved with the earliest civil rights movements.
Malcolm X rejected the civil rights movement and actually defended that blacks were superior and should have supremacy.
Little Rock Nine was one of the events present at the earliest civil rights movement. Little Rock Nine was the name given to a group of nine African American students that, in 1957, were finally enrolled in the Little Rock Central High School after the Little Rock Crisis where black students were forbidden to enter the school.
Rosa Parks was also part of the earliest civil rights movement. Rosa Parks was an activist that made part of the Montgomery bus boycott - one important event in the Civil Rights Movement.