Re: Intellectual property
These are all good points, but like the other poster do not address my point. I simply stated that I don't think that there's any US legal problem with doing it. There will be significant other obstacles to it, much the same as any putative Labour government would find out if they actually tried to implement their 'steal foreign-owned companies' policy.
But I cannot see any theoretical obstacles to invalidating patents belonging to an 'enemy', suitably defined. Seizing patents would be very similar to seizing bank accounts and other property, and would not, in and of itself, precipitate the collapse of the USPTO.