Peter Dreier, Robert Elias - Baseball Rebels - The Players, People, and Social Movements That Shook Up The Game and Changed America-University of Nebraska Press (2022), PDF, American Civil War
San Francisco Giants manager Gabe Kapler to skip national anthem after Uvalde
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Amid Gun Violence, Giants' Gabe Kapler Will Not Stand for Anthem - The New York Times
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Giants manager Gabe Kapler says he will skip national anthem going forward to protest US gun control : r/sports
San Francisco Giants manager Gabe Kapler's protest highlights eruption of sports messaging on gun violence