People of color were certainly repressed during this time frame, but not because of punitive tax rates on the highest incomes.
I can’t think of any mechanism wherein people of color in the 1940s through the mid 1960s would have been better off if rich people were taxed lower. So, I would have to disagree with your assessment: The confiscatory top-tier tax rate did, indeed, benefit people of color, just not nearly enough to offset the harms of legislated segregation and institutional racism.
People of color were certainly repressed during this time frame, but not because of punitive tax rates on the highest incomes.
I can’t think of any mechanism wherein people of color in the 1940s through the mid 1960s would have been better off if rich people were taxed lower. So, I would have to disagree with your assessment: The confiscatory top-tier tax rate did, indeed, benefit people of color, just not nearly enough to offset the harms of legislated segregation and institutional racism.