technically, he was actually working for the good guys (anti-hydra-shield for fury). cap was still helping hydra-shield, unknowingly.
since you referenced the movie, there was something very interesting to note about the story line and how it relates to real life. almost as if the author was trying to get the word out.
(if you haven’t seen ‘the winter soldier’ sorry for spoilers... but come on, it’s been almost a year)
movie:
1. hydra, the bad guys working with the nazis
2. they lose ww2 and go into hiding
3. they hide inside shield
4. they work from inside to create chaos around the world
5. their goal is to get the world to beg them (hydra-shield) to ‘protect’ us against terrorism
6. they infiltrate all branches of govt
7. their mission is to rule the world via shield
real-life:
1. progressives align with the nazis pre-ww2
2. nazis lose ww2
3. progressives go into hiding
4. progressives resurface inside the democrat party
5. democrat-progressives sell panic and dependency to grow cradle-to-grave society
6. progressives infiltrate the republican party
7. their mission is to rule the world via military might and corruption
There are quite a few parallels there. I thought the movie was pretty good.