Count Nefaria

Count Nefaria runs the Maggia, an organized crime organization which sometimes co-operates with HYDRA.

He has not actually appeared in the series, but mentioned in passing by the Grim Reaper.  Also mentioned in AEMH comic, V2 #8 in passing between the Hulk and the Black Panther.

Count Nefaria

From his first appearance in the Avengers comic.