Better data on just the top earners ( note 91% was the highest rate):
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However, despite these high marginal rates, the top 1 percent of taxpayers in the 1950s only paid about 42 percent of their income in taxes. As a result, the tax burden on high-income households today is only slightly lower than what these households faced in the 1950s.
Taxes on the Rich Were Not Much Higher in the 1950s | Tax Foundation