Belafonte "provided money to bail Dr. King and other civil rights activists out of jail. He took part in the March on Washington in 1963. His spacious apartment on West End Avenue in Manhattan became Dr. King’s home away from home. And he quietly maintained an insurance policy on Dr. King’s life, with his family as the beneficiary, and donated his own money to make sure the family was taken care of after Dr. King was assassinated in 1968."

https://www.nytimes.com/2023/04/25/arts/music/harry-belafonte-dead.html?smtyp=cur&smid=tw-nytimes

Harry Belafonte, 96, Dies; Barrier-Breaking Singer, Actor and Activist

In the 1950s, when segregation was still widespread, his ascent to the upper echelon of show business was historic. But his primary focus was civil rights.

The New York Times