When President Truman took a hard line against striking workers in the years immediately following World War II, he:
"had little understanding of the plight of laborers in the post-war years."
During the first months of his administration, he became involved in a struggle between coal miners and railroad workers. It took several meetings, and fierce arguments, to get them to agree, and end the strike.
Would it be Jim Crow Laws? The Court found nothing unconstitutional about what happened and nothing was truly done about the Segregation until Brown vs. Board of Education 1752-1754.
Lowered and eliminated voting qualifications
The contribution that the Catholic Church hopes this helps