The coffin of civil rights activist, Steven Biko, lies on a wooden cart pulled by oxen after he dies while in detention

Steve Biko was arrested and died in police detention. His funeral, with a coffin carried on a wooden cart by oxen, symbolized his role as a key figure in South Africa, akin to Martin Luther King in the U.S.

In what way is Steve Biko compared to Martin Luther King?

What significance does Steve Biko hold in South African history?