Alexander Pierce was the head of the World Security Council.and a former leader within S.H.I.E.L.D. until it was revealed that he was the mastermind leading HYDRA from within the government organisation.
Brock Rumlow, also known as Crossbones, is a S.H.I.E.L.D. agent and a world-class hand-to-hand fighter, with an extensive experience in street-fighting and various martial arts and military combat techniques.
Jack Rollins is a S.H.I.E.L.D. agent under Alexander Pierce's control like Brock Rumlow. He fights Captain America and his allies.
Georges Batroc, also known as Batroc the Leaper, is a French mercenary, kickboxer and martial artist. He is an Olympic-level weightlifter and has extraordinary agility and reflexes. His leg muscles are particularly well developed enabling him to leap great distances equal to an Olympic athlete. He is an expert hand-to-hand combatant and specializes in savate (French-style kickboxing). He is also a skilled military tactician, having formerly been in the French Foreign Legion.
Sharon Carter is an agent of S.H.I.E.L.D. and love interest of Captain America. She is most probably the grand-niece of former Agent Peggy Carter.
