What is the fine-grained topic of the following text: And then there's the Fearsome Foursome (LA Rams defensive line of the late 60s), the Over the Hill Gang (1972 Redskins defense), Air Coryell (late 70s SD Chargers offense), Ground Chuck (LA Rams/Bills/Seahawks running attacks under coach Chuck Knox), Doomsday Defense (1970s Cowboys defense), Killer B's (1982 Miami Dolphins defense), the Ain'ts (woeful 1980 NO Saints), Kardiac Kids (1980 Browns), and my favorite, the Electric Company (1970s Buffalo Bills offensive line, who blocked for OJ Simpson, in effect, turning on the Juice). Only return the topic.
Nicknames of historical American football teams and formations