He probably learned those employment discrimination tactics, IMO, from President Woodrow Wilson, who was a racist himself and set back all the progress black people had made with the help of Presidents Lincoln and Garfield who wanted equality for black in 1860s and 1880s America. Anybody applying to Washington D.C. jobs during Wilson’s terms in office had to provide a photo of himself so they employers would not hire the “wrong colour.” He segregated the military, he segregated the office jobs, he set it up so that blacks could not socially and financially progress and better themselves and were barred from moving up the ladder. Presidents Truman and Kennedy changed those things so blacks were not discriminated against anymore.
Needless to say, the racists hated that.