Which LBs were on the 1970s Steelers teams?

Today’s question: The defensive front four of the Pittsburgh Steelers teams of the 1970s was known as the “Steel Curtain.” Led by defensive linemen “Mean” Joe Greene and L.C. Greenwood, their defense was one of the most famous defensive units in the history of the National Football League. Who were the linebackers on those great Steelers teams?

Yesterday’s answer: The highest-paid current St. Louis Cardinal is veteran pitcher Adam Wainwright, who makes $19.5 million per season.