Peter Norman of Australia paid a price for supporting his fellow Olympians' fight for human rights.
Accused of racism a year ago, the 49ers coach is in the middle of a civil rights movement.
Kaepernick is not the first – and likely won't be the last – to use his athletic stage to make a political statement.
An Olympian known for his politics says athletes shy away from activism.
ESPN Launches Sports Humanitarian Awards
Olympians who have played pro football range from Hall of Famers to big busts.