Judging by their name, they are a obvious reference to the Umbrella Corporation. But what do you think thier true motives are. Some people say that they are trying to resurect Umbrella, but i think that they are a terrorist group who are aiming to cause a global pandemic. Derek C. Simmons seems to be the leader of this mysterious organisation as he intends for all major citys to suffer from a bio-terrorist attack. He is also the presidential aid to the deceased Adam Benford, so he has all the power in the world to perform such actions without anyone suspecting it was him.
But thats what i think, whats your opinion on them, what do you think there true motives are?
Another theory i'm suggesting is that they could be the mysterious organisation featured in Resident Evil 4, who Ada Wong was working for.