Not sure about your assertion. I’m currently finishing up Goldberg’s “Liberal Fascism”,
and progressive support of fascism was a huge factor in the Great Society and New Deal.
It was more about collectivism and top down control than it was about helping poor minorities.
Since “Uncle Tom” was the slave who loved those who kept him down—and “Guilty White-Folks” are the people who love a man who wants to shove them down—we can make a correlation.