Bunche was an African-American political and diplomat who received the Nobel Peace Prize in 1950.
Prize given to him for his work as a United Nations (UN) mediator in Palestine in the late 1940s (1948) during the conflict between Arabs and Jews. Mediation process in which the armistice between the two parties in conflict was achieved.
It should be noted that until 1950 all the winners had been white, so Ralph Johnson Bunche was the first African-American winner in the history of the Nobel Peace Prize.