President rules

[Ms. Mudpie]

he banned everyone from the city but the government
I've seen this happen a lot of times. It's perfectly acceptable.

made people pay cops to get gas
I don't see what's wrong with this.

was holed up in a fort in the villa near the Corleone spawn so nobody could kill him
That's called 'protection' and it goes without saying that presidents are allowed to hire security.

And to be honest, this actually sounds like quite fun roleplay. Shame I missed out.