Among his special assistants was George Edmund Haynes, 1918 to 1921, who was the first African American to earn a doctorate from Columbia University. Haynes served as Director of Negro Economics in the United States Department of Labor. Competition was fierce for the higher-paying jobs in the defense industries, and during Red Summer of 1919, whites attacked blacks in numerous cities. Haynes tried to mitigate racial conflict in employment, housing, and recreation. He also continued his earlier work in studying how blacks were excluded from certain trade unions, interracial conditions in the workplace, and issues in child labor.