During the civil rights struggle in America, not every white person agreed with the idea that black people should be oppressed or segregated. There were many white allies, who supported the struggle and stood side by side with their black peers.
Being a white civil rights activist could sometimes get you in serious trouble. This is James Zwerg, who took part in the Alabama Freedom Rides in 1961, but was set upon by a white racist mob as soon as he left the bus.