"Name a Country Where 70% Tax Worked"

[PETRUS]

44. Also, the Federal income tax isn't the whole picture.

I'm more or less agreeing with the general thrust of your argument here, and thought you might be interested in some further thoughts.

The Federal government collects taxes other than the personal income tax, as do states and localities. The actual effective tax rates (not just the statutory rates) were much higher mid-century. From Saez and Zucman (in their book, The Triumph of Injustice):

"The average tax rate of the top 0.1% income earners neared 60% in the 1950s and reached close to 70% for the top 0.01% in 1950, when higher corporate taxation generated massive revenue and equity ownership was still highly concentrated."

For comparison, the actual effective tax rate (when taking everything into consideration exactly as the above quote does) for the top 0.1% in recent years is around 30%, and is even lower for the top 0.01%.