The National Football League is a staple in American sports. Not only does it introduce huge stars, but it culminates in the world-renowned Super Bowl. However, in recent years the league has become quite controversial. Most notably, quarterback Colin Kaepernick famously knelt during the national anthem, sparking a huge debate about freedom of speech.
But the NFL has seen plenty of scandals over the years. Here's a rundown of the most controversial. Click on!