MLS 2020: Fans boo as football players take a knee, Nashville vs Dallas
Takeaways from the NFL's kneeling era
Cowboys take a knee as a team before the national anthem
Many NFL Players Protest During Anthem After Trump Attacks
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Cowboys kneel before national anthem on Monday Night Football - Chicago Tribune
MLS fans boo players for kneeling during national anthem
Four Dolphins kneel, Chiefs CB Peters raises fist during national anthem
1 in 8 NFL players don't stand for anthem
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NFL players who protested during the national anthem in Week 3 2017 - ESPN - NFL Nation- ESPN
An Uneven Racial Playing Field Is a Lingering Problem Sports Can't Beat - InsideHook
NFL: Players continue protests and remain defiant
Euros and taking the knee: Why some England fans say they are booing players - BBC News