Sports and politics getting mixed up together: It's been all over the news lately, and yet it's been going on forever. The debate over NFL quarterback Colin Kaepernick, who began taking a knee during the national anthem to protest racist treatment of black Americans, is just the latest controversy in a long history of athletes expressing themselves politically. And it's not just players on the field who do it: Team owners, athletic organizations, and even entire nations have used the power and popularity of sports to make political statements. In this gallery, we take a look back at the messy history of sports and politics, as seen in 66 pictures...