Monopolies and cartels are the cancers of the free market. It is the chief duty of the public to intervene in the free market so as to keep it free. Oligarchies and libertarian corporate rule is just as dangerous to the free market as socialism.
We do this with redistribution of forcibly collected means through direct and indirect taxation as well as defining the rules the private actors are allowed to operate under.
Adam Smith understood this. People claiming to have read what he wrote, usually do not.
The goal of any public policy should be to maximize the opportunities for the citizenry to seek fulfillment. The countries that achieve this the best, like in modern day Scandinavia for example, do so with a combination of free markets and publicly guaranteed services.