He renounced racial discrimination and attributed his segregationism to youthful excess.
From the theatlantic.com
He adopted hard-line segregationism, and used this stand to court the white vote in the next gubernatorial election.
From the en.wikipedia.org
Inevitably, perhaps, Wallace has been moving toward the middle of the road, seemingly giving up his militant segregationism and many of his longtime redneck associates.
From the time.com
More examples
A political orientation favoring political or racial segregation
(segregationist) segregator: someone who believes the races should be kept apart
Racial segregation is the separation of different kinds of humans into racial groups in daily life. It may apply to activities such as eating in a restaurant, drinking from a water fountain, using a washroom, attending school, going to the movies, or in the rental or purchase of a home. ...
(Segregationist (short story)) "Segregationist" is a science fiction short story by Isaac Asimov. The story was written in April 1967 and was first published in December in Abbottempo, a magazine produced by Abbott Laboratories, then later included in the collections Nightfall and Other Stories ...