What's the noun for corporatocracies? Here's the word you're looking for.
corporation
A group of individuals, created by law or under authority of law, having a continuous existence independent of the existences of its members, and powers and liabilities distinct from those of its members.
(Britain) The municipal governing body of a borough or city [since 1974 obsolete except in the City of London]
“The corporation grew rapidly, and she rose through the ranks, becoming the deputy head of the legal department.”
“Thirty-three years ago, he even won a seat on the city corporation for one term at a time when the Tories were serious contenders for power in George Square.”
“He was a big chap with a corporation already, and a flat face rather like Dora's, and he had a thin black moustache.”