Jackie Robinson broke baseball's color barrier but these Black players still faced racism
Jackie Robinson wasn't the only Black player to break barriers in MLB
Jackie Robinson Celebrated Amid Decline of Black Players in MLB
Jackie Robinson receives hate mail.
Jackie Robinson wasn't the only Black player to break barriers in MLB - The Washington Post
The Real Story of Baseball's Integration That You Won't See in 42 - The Atlantic
Celebrate baseball great Jackie Robinson with this poster
MLB players write letters to Jackie Robinson
Letters to the Sports Editor - The New York Times