The difference between the Steelers run and the Patriots run is that the league changed the rules in the ‘70’s to hinder the Steelers (Mel Blount Rule), but changed the rules in the 2000’s to help the Patriots (Brady Rule).
but changed the rules in the 2000s to help the Patriots (Brady Rule).
The Brady rule was the lunging from the ground at the knees of the QB. You probably mean the Carson Palmer rule which was in place before that.