.org is operated by PIR (actually afilias in dublin according to wikipedia) not sure exactly how much leverage the US has over it currently.
So far the US has not publicly tried to drop wikileaks.org, forcing WikiLeaks migrate to a TLD that is clearly outside US reach. Maybe they wouldn't want the bad press.
I'm wondering what is possible if I simply have a relationship with a reseller in the US (e.g. the one with the superbowl ads, or eNom), but my TLD registrar is outside of reach. I assume they could make the reseller drop the contract, or terminate it.