Not just the USA, but probably many other countries as well.

For example, in Estonia there's an oligarch named Margus Linnamäe, who owns all the authorized Apple resellers, over 90% of the pharmacies, almost half of the media, almost all the movie theaters etc... This guy can set any price without any competition.

A while ago this guy shut down the most of the pharmacies in the country for a day (in the name of a strike) because government was trying to pass a law affecting him.

No one, especially oligarchs like him should be allowed to have such power.