One aspect that changed the NFL forever was former Oakland Raiders’ owner Al Davis.
Yes, Al Davis all by himself changed the landscape of the National Football League.
In 1980, he attempted to move the Raiders to Los Angeles but was blocked by a court injunction. You see, Davis didn't ask permission from the league. At the time, the league by-laws under Rule 4 stated that any relocation of any NFL club had to have the approval of three-fourths of all team owners in the league.
Davis was having issues with his current stadium in Oakland, the Oakland-Alameda County Coliseum; which was built in 1966 and was also used by the baseball Oakland A’s.