Is there an oligarch that collects taxes for the USG?

Yes, it is called the Fed, and they tax buy inflation, and by a 5% cut of all the money they printed.

How does identifying oligarchs help me not pay taxes?

In the future, probably near, people will realize where their taxes are going... Lots where they do not want, and little where they do want, and, en mass, people will stop paying their taxes.

We don't need to identify anyone to ignore them.

Many people do not realize they are living their lives based on the lies of these people.
Consumerism is one example.
That we are in the hottest summer in recorded history is another.

Unless you want to ignore everything, you have to know who and why. If you know the mother WEFers are trying to sell you prison as the new freedom, then you can tune them out. Ignore them.

Else, it is everywhere. Woven into every discussion on every media.