Falcons trivia: Which two former coaches are in the Hall of Fame?

The Falcons, believe it or not, have had two Hall of famers coach for them. It’s just that neither of them are in the Hall of Fame for anything they did as coaches, which figures.

One was a coach for several seasons for the Falcons and was famous for his willingness to fight basically anyone at any time for any reason, while the other was only an interim. Both were legendary players who made it to Canton on those merits, and neither enjoyed a winning record in Atlanta, not that it’s at all unremarkable.

Who were these two coaches?