In Thor when S.H.I.E.L.D "appropriates" Jane's stuff, when she asks who they are Erik says
I knew this scientist, a pioneer in gamma radiation. S.H.I.E.L.D showed up, and that's the last I heard from him.
I assume he is talking about Bruce Banner since S.H.I.E.L.D had a file on him for the Avengers Initiative and he was working on gamma radiation for regeneration (according to the 2003 and 2008 films).
Erik seems to imply that S.H.I.E.L.D had a hand in Bruce's disappearance and they knew where to find him in The Avengers (though that could just be Intel gathering).
So i am wondering, what was S.H.I.E.L.D's role in Bruce Banner's Origin story in the Marvel Cinematic Universe?