Redford is actually the bad guy. The Winter Soldier is a top secret SHIELD project known only to a select few, not even Fury.

Fury poses too much of a threat to the way Redford wants to run things so he uses Crossbones and Winter Soldier to take Fury and Cap out. They prob wanna axe Fury for allowing The Avengers to steal the show. SHIELD is Big Brother and they don't want ordinary people believing theres a higher power than the one they have.