Contact sport - Wikipedia
American Football, A Truly Barbaric Sport
Andrés Escobar, an Own Goal, and Tragedy at the 1994 World Cup - The Ringer
Serious fan violence taking on life of its own; can it be stopped?
Raiders Fans Most Disrespected in American Sports – Rolling Stone
When sports fans fight: Why violence in the stands, online rage are spreading
In Argentina, Violence Is Part of the Soccer Culture - The New York Times
Football: The Ivy League Origins of an American Obsession: Bernstein, Mark F.: 9780812236279: : Books
Wrestling Is Fake, But the Injuries Are Real - The Ringer
Violence at high school football games a nationwide issue amid referee shortage - Sports Illustrated High School News, Analysis and More
Injuries make the NFL a brutal sport. But the violence is partly why fans love it