4. 1924 Olympics
During the Olympic rugby union 1924 final between France and the United States at Colombes Stadium, French fans booed and hissed the American team for the remainder of the game after star player Adolphe Jauréguy was flattened by a hard tackle two minutes after the opening whistle, leaving him unconscious with blood pouring down his face and having to be carried off the field on a stretcher.
In the second half, French fans threw bottles and rocks onto the field and at American players and officials, wild brawls broke out in the stands, U.S. reserve Gideon Nelson was knocked unconscious after being hit in the face by a walking stick, and French fans invaded the pitch at the final whistle, leaving the French team, aided by the police, to protect the Americans.
At the medal ceremony, The Star Spangled Banner was drowned out by the booing and hissing of French fans, and the American team had to be escorted to their locker room under police protection