John Carlos, Tommie Smith: 1968 Olympics black power salute - Sports Illustrated
NFL great Jim Brown, known for his activism, says he would never kneel for anthem
U.S. national anthem kneeling protests - Wikipedia
The exile of Oakland A's Bruce Maxwell and the birth of MLB's Black player movement - ESPN
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Jim Brown, civil rights champion: 'I'll never kneel' during anthem
Mahmoud Abdul-Rauf opens up about the state of activism in professional sports
George Floyd: As heated protests continue, Minnesota governor warns of 'extremely dangerous situation'
The courage of Colin Kaepernick
Hall of Famer Jim Brown says he'd 'never kneel' during anthem, 'will always respect the flag'