That was Baron Strucker. I think he's generally Nick Fury's arch-enemy. Baron Zemo was Captain America's main enemy in the early issues of the Avengers (the first Baron Zemo is the one who "killed" Bucky, though he was killed off in issue 15 of the Avengers; he had a son who became the second Baron Zemo, but I'm not sure what's going on with him). It's understandable to get them mixed up; I can't recall if they mentioned Strucker's name in Captain America 2, and they're both barons who work for Hydra.
Too many Barons!