Who were the steelcurtain?

Answer 1

The "Front Four" of the Steelers defensive line in the 1970's, aka the "Steel Curtain", were:

"Mean" Joe Greene - tackle

LC Greenwood - End

Ernie Holmes - Tackle

Dwight White - End

Later in the 70s, the "Steel Curtain" included the whole defense which included:

Mel Blount - cornerback

Jack Lambert - Linebacker

Jack Ham - Linebacker