Assertion: baseball's player | /r/HasProperty | black
Facets:
Source sentences:
text: Major league baseball excluded black players, who had a separate league –
text: When the Dodgers signed Robinson, they heralded the end of racial segregation in professional baseball that had relegated black players to the Negro leagues since the 1880s
text: Professional baseball banned black players from America’s pastime until Jackie Robinson broke the “color line” in 1947.