How could any capitalist organisation take such advantage without the support of the force of law?
LOL
Ever hear of a monopoly?
Sure, do you have an example of one? Unless you're talking about an extremely limited resource that is found only on a piece of land owned by a single entity, monopolies are practically impossible without government meddling in support of that entity.
But what if that entity becomes rich enough to buy off most and force the holdouts into bankruptcy by strong arming suppliers? See, Standard Oil. The reason it doesn't happen now is because of a strong government, not despite it.