The NFL-AFL merger happened in 1970. Since that happened 134 NFL Hall of Famers have been drafted (and some players who were not drafted, like Kurt Warner, have made the HoF) and been inducted into the Hall of Fame (including those who will be inducted later on this year). This does not include players who played after the merger but were drafted before it like Bronco draftee and Hall of Famer, Curley Culp. Culp was drafted with the 31st pick in the 1968 draft by the Broncos but never played for the team.
The Broncos have drafted four of these guys.