Every American knows the fable of the Progressive Era and that “trust buster” Teddy Roosevelt wielding the big stick of federal power to battle the greedy corporations. We would be better off if more people knew the work of the man who dismantled this myth: historian Gabriel Kolko, who died this month at age 81.

Kolko was a self-described socialist and a Harvard-educated historian, but he had little use for the liberal political establishment’s pious regard for the Progressive Era of 1900 to 1916. And he was never credulous enough to believe that government intervention in the economy was generally in the public interest.