It's pretty easy.
Tax corporations and close tax evasion loopholes, then strictly redefine what it means to be a corporation that operates in the United States so that they can't claim it in name while sheltering a large amount of their capital elsewhere, and incentivize students from other countries traveling to the US to study to remain and give them an easy path to citizenship so that the academic capital stays in the US.
The middle class in the United States was the largest when the corporate tax rate was the highest. When was this time of terrible government overreach? Oh, right, the 1950s and 1960s, the supposed "halcyon days of the United States."
It's interesting; the republicans always want to seem to "return to the 1950s" without having any of the legislation and government climate that defined the "good" aspects of that era.