Last week President Trump disparaged professional football players for kneeling during the national anthem. The president’s comments generated gestures of unity at NFL games Sunday. The Atlanta Falcons were among the many players, coaches and owners who locked arms during the anthem to protest racial injustice. Fifty years ago two Olympic athletes brought this kind of silent protest to the medal podium. Track stars Tommie Smith and John Carlos raised their fists during the ceremony. We revisit a