First, the Oligarchs stole it from the Workers by diverting 95% of the value added by the Workers into the Oligarch's profits. (I say that 10%-20% is plenty of a return on investment...not 80%-90%). This is possible only with monolopy behavior supported by corrupt laws.
Then, the Workers took back a chunk of those profits (which...should have been the worker's in the first place) in the form of progressive taxation. (Although, this still doesn't mark a complete return of the stolen wealth to the Workers...but, instead to Government programs that benefit the Workers...a far cry from true self-control of resources.)
Then, the Oligarchs once again took back those profits they stole from the Workers with a government that does not represent the Will of The People through Gerrymandering, voter suppression and conservative court packing.
Billionares and Trillionares should not exist. The only way for anyone to hoard that much wealth is by claiming resources that they did not produce themselves.
If we had a Living Wage and Just Profit Sharing, everyone would have all the resources they would need to thrive in whatever manner they choose for themselves.