One of the original members of the defensive line, Gary Larsen, was replaced in the mid-1970s by Doug Sutherland. The Purple People Eaters were a major factor in the post-season success of the Vikings from the late 1960s through the 1970s. The Purple People Eaters were one of the most identifiable Front Fours in National Football League history, with the "Fearsome Foursome" of the Los Angeles Rams during the 1960s and early 1970s, the "Steel Curtain" of the Pittsburgh Steelers during the 1970s, and the "New York Sack Exchange" of the New York Jets during the 1980s. Despite not winning a Super Bowl in any of their 4 trips (Super Bowls IV, VIII, IX and XI), the Vikings' defense is considered arguably among the greatest defense of all time.