It is pretty funny you refer to these periods because they are the quintessential example of big business pushing for regulations to push out their competitors and become monopolies. And the "progressives" enthusiastically supported such monopolization.
Regulated monopolies are much better than unregulated ones. Free markets generate the latter, and they have created most of the big issues we have today: inequality, climate change, the military industrial complex.
This is so vague as to be impossible to pin down what you mean in order to refute it without you slipping out of it. But in very general terms, trust busting was a real thing that happened in this country once upon a time, yet would be unimaginable under the current ruling class.
