1. http://en.wikipedia.org/wiki/Executive_Order_6102
edit - typo, link
On the other hand, the executive order power is not very democratic. http://en.wikipedia.org/wiki/Executive_Order_9066 was a much more serious human rights violation. But the gold confiscation order was preapproved by congress: http://en.wikipedia.org/wiki/Emergency_Banking_Act immediately after an election had happened.
Interestingly, all the Bitcoin heists are great examples of this. What are they other than (digital) violence? I think they clearly demonstrate that when people are unrestrained by some power, that many people will realize it is advantageous to take rather than to transact in mutual ways. Now, I'm willing to entertain the idea that there are solutions to this problem that don't involve centralized power, but I disagree with libertarians who throw around the word "violence" as if it's some creation of government rather than something intrinsic to and widespread within society. It's not something that can be taken off the table with a declaration, but a problem that must be managed through some mechanism.
Anyway, this is a great thread on all sides.
It's even still technically possible for bitcoin users to agree on a code change that would keep making coins forever (like dogecoin). It would result in a hard fork of the blockchain, but if most clients agreed to it, it would work just fine.