Ok, most people think of the United States Government, but in reality, we shouldn't. The most powerful organization ever is logically the eBay Corporation, here's why:
eBay owns PayPal, which can provide money through digital means, meaning it could theoretically hand out cash like it was nothing, say, $40,000,000,000 per user...
What that would do, in turn, is create hyperinflation, by crashing the US Dollar into the ground even harder than it has fallen in the past, which would in turn, crash the economies of like 5 countries which base their monetary unit relative to the US Dollar, for stability in the world economy. With their economies crashed, it would crash the economies of the countries they trade with, which would domino out and destroy most national economies.
While that's going on, all multinational US based companies would tank, because A) you'd have a ton of people buying A LOT of crap (before the inflation set in, it wouldn't be instant, it'd probably take like 12 hours) B) companies would be shreded up by the inflation, because remember, they didn't get $40,000,000,000, so consider a company like Apple for example, with yearly revenues around the $20,000,000,000 mark, they'd be toast (even companies like IBM would be toast, more or less).
After all of the major multinationals based in the US fell apart, along with most major stock exchanges, it'd pretty much clean off all of the other non-US multinationals like NEC, Toyota, Sony, Samsung, et cetera...
Now I'm sure this couldn't actually happen quite like this, because I don't think the IRS and FDIC would be that happy if PayPal just started creating money randomly (also consider that given that there are like 20 million users, x 40,000,000,000 each, that's A LOT of money to just bullshit out of nowhere)
Still, just consider that for a minute, the thing stopping ebay is that if they just printed money out of thin air it WOULD destroy everything, including them, and they can't threaten anyone because of like "ZOMG WE KILL UR ECONOMY" because the government would just trash them...
Interesting to consider, nonetheless