Short answers, pulled from the story.
The league suspended the Maroons after they played an unauthorized exhibition match against the Frankford Yellow Jackets. This suspension removed them from contention and allowed the Cardinals to claim the title despite losing their head-to-head matchup.
The NFL has investigated this case twice since then but upheld the decision to award the title to Chicago. The league rules at that time stated the team with the highest win percentage would automatically claim the title without a playoff game.
Robert Irsay moved the team under cover of darkness using Mayflower Transit trucks to avoid Maryland State Police intervention. Fans remained unaware until the team had already departed, sparking debates about loyalty between cities and franchises.
Pathologist Bennet Omalu discovered chronic traumatic encephalopathy in Mike Webster's brain in 2005. This finding led to research showing CTE present in three hundred forty-five out of three hundred seventy-six former NFL players examined by Boston University.