Art Modell
Modell remains one of the most polarizing figures in the NFL’s history. That’s because two fanbases have staggeringly different perspectives of the media tycoon. On the one hand, Cleveland fans despise him because he stripped the Browns from their city, albeit for a short period.

But Baltimore loves him because he reintroduced an NFL franchise to the city in the form of the Ravens. However, there wasn’t a moral compass involved in this process because he wanted to make more money. The Browns returned to Cleveland but never had the same success again (via USA Today).