A Pittsburgh Steelers defensive lineman in the classic 1970s black and gold uniform breaks through an offensive line under stadium lights, capturing the intensity of the Steel Curtain defense.

The Steel Curtain: Pittsburgh Steelers 1970s Dynasty

The Pittsburgh Steelers 1970s dynasty is the standard against which every other run of sustained excellence in professional football is measured. Four Super Bowl championships in six seasons. A defense so suffocating it earned a nickname that referenced both the city’s industrial identity and the most foreboding geopolitical barrier of the Cold War era. A…