Dennis Smith was one of the best Defensive Backs in the history of the Denver Broncos. 

A member of the Los Angeles Rams for his entire 11-year career, Larry Brooks started at Defensive Tackle for the first ten of his seasons.  Brooks would settle in as an elite player going to five straight Pro Bowls (1976 & 1980) and was a First Team All-Pro in 1979.  He was a large part of the Rams' success in the late 70s and early 80s and helped them reach Super Bowl XIV.  He would win a Super Bowl later in his career as the Defensive Line Coach for the Green Bay Packers in Super Bowl XXXI.

Playing his college ball at the University of Tennessee, Beattie Feathers would have an incredible rookie season with the Chicago Bears where in 1934 he would become the first 1,000 Yard rusher (though there are some football historians who dispute the accuracy) and he would also lead the league in All-Purpose Yards and Yards from Scrimmage and was a First Team All-Pro.  In the six seasons he played after (with Chicago, Brooklyn, and Green Bay), he didn't tally as much as he did as a rookie, but that campaign was so incredible and historical that he deserves a spot here.

In terms of notoriety, there are few on the defensive side of the ball that can match Lyle Alzado.  Known for his anger and ferocious play on the gridiron, Alzado debuted in 1971 with the Denver Broncos and in the season after he would lead all players in Fumble Recoveries.  Alzado played predominantly at Defensive End, and after missing most of the 1976 season due to blowing out his knee, he would come back and help the Broncos and the mighty Broncos' defense reach their first Super Bowl.  A contract dispute saw him traded to the Cleveland Browns, and he would later be traded to the Los Angeles Raiders where his popularity rose, and he would help them win Super Bowl XVIII.