There could be, but I don't think that there's small group of people who are ruling the whole world. I think this small group of people have enormous impact on today's society but I don't think they are controlling everything. But money, politics... yes, probably.
If you control the world's financial flows it is possible to control the whole world. It seems to me that world government is not. There is a small group of countries which has a large impact on the global economy, but no more. With money they can do a lot, but not all.
One important thing I learned from people, who have access to managing substantial share of world finances.
They are completely not free. Just they are completely regulated by efficiency of finance management.
The main problem of people, who manage finance is efficiency and not to loose those finances and management instruments.
The very last thing they care are their personal interests.
These are highly professional people and I would say in they work they are much much more restricted than majority of the people.
Global bankers main goal - is to prevent what happens with cryptocurrencies. To prevent volatility, lack of funds, investments efficiency etc., many other parameters and they really burn themselves to make it happen.