After the whole Hydra reveal occurred in Captain America 2, I've been questioning other Marvel movies that had ANY Shield references or familiar faces that happen to appear in previous Marvel movies and I found something that might have some credibility.
SPOILER: Senator Stern was seen in Captain America 2 whispering to agent Sitwell "Hail Hydra". Keeping that in mind, in Iron Man 2, Senator Stern was seen telling Tony Stark to hand over the Iron Man suit. Was this an implication that Stern wanted to use the Iron Man suit for Hydra's purpose? Or was it just a big coincidence and Senator Stern wasn't yet Hydra in Iron Man 2? ... What do you think?