What was the nickname of the Dallas Cowboys' defense in the 1960s and 1970s?

What was the nickname of the Pittsburgh Steelers' 1970s defense? What was the nickname of the Minnesota Vikings' 1970s defensive line? What was the nickname of the Los Angeles Rams' 1960s defensive line? What was the nickname of the Seattle Seahawks' secondary in the 2010s? What was the nickname of the Denver Broncos' 1970s defense? What was the nickname of the Miami Dolphins' defense in their 1972 perfect season? Which team is known historically as the "Monsters of the Midway"? Which team has long been nicknamed "America's Team"?