Sacks didn't become an official stat in the NFL until the 1982 season, meaning most of the legendary 1970’s Steelers don't actually have any official sacks to their name. While many have wondered why the league couldn't just go back and record one of the most popular stats in the game, one unofficial source did just that and gave us sack numbers dating all the way back to 1960, a full 22 years before sacks being recognized.
Pro Football Reference is a source many outlets use for their official statistics including right here at Behind The Steel Curtain.