Harlem crime boss Stone-face was seemingly set up to be Sam Wilson's mob boss villain. Falcon had frequent conflicts with Stone-Face and was arguably his arch enemy in the seventies and early eighties.
Sam's nephew Jody Casper idolized Stoneface and worked for him as runner. Stone-Face kidnapped Falcon's girlfriend Lelia Taylor.
Stone-Face also went up against heroes like Spider-Man, Black Panther, Captain America (Steve), Luke Cage and Iron Fist. Seemed like he was inspired by Harlem mobster Bumpy Johnson. I suppose they could modernize the character bring him back if they wanted to.