Long before Branch Rickey signed Jackie Robinson to a Brooklyn Dodger contract in 1945, Lester Rodney, the newly hired and first sports editor of the Communist Daily Worker, launched the campaign that proved decisive in eventually breaking baseball's color line. But in the hostile anti-Communist climate of those years and for many years after, Rodney's story remained largely unknown. It therefore came as a surprise to many when Arnold Rampersad, in his authoritative 1997 biography of Jackie Robinson, wrote: In the campaign to end Jim Crow in baseball, the most vigorous efforts came from the...