NKVD
Cossack
its that simple... you can say why if you want. I only do it like once every 20 games I think
Change capital? Is it possible? Or, better, is it thinkable? No.
Many capital cities are in a "not good" position, for the manteinace cost, and are not changed (in the real world). I mean, Washington is in the east coast, far away from California, and no one wants the capital to be moved to, say, Omaha, just because is in the middle of the country.
The same can be said for Moscow, Beijing, or, in a smaller scale, London or Paris.
Anyway, in Argentina there was a plan to move the governemt to Viedma (a small town in Patagonia) just because is the middle (almost) of the country...
I believe Kazakhstan moved its capitol to Astana from Almaty (near the border with Kyrgyzstan) partly for that reason as well.