And... this is where the deluded conspiracy theorist accusations the upthread poster was complaining about come from.
There's no evidence for any of that[1]. The ME's capabilities (low level system controller with access to all memory and hardware, with special access to network hardware that can operate cleanly along with a running OS) have been known and even advertised by Intel for years. The news of the moment is that it's subject to a few rather embarrassing exploits.
But that's rather better explained by incompetance instead of evil. Yet everyone jumps to "back door" because that sounds more fun I guess. (In fact, to the extent there is evidence of government involvement here, it's in the opposite direction: the NSA appears to have demanded an "off switch" for the ME).
[1] Edit to clarify: I'm talking about the ME folks. Yes, the government does bad things. The EC flaws under discussion in this subthread are not among them, so citing them as evidence paints you as a conspiracy nut and not someone serious about security.