If this was condoned by the US Supreme Court explicitly, this was the law of the United States that anyone anywhere could be discriminated against based on the color of their skin.

The federal army - ie run by the US was officially segregated until 1948 but it really was through the late 50s.

https://www.archives.gov/milestone-documents/executive-order...

The GI bill run by the federal government was discriminatory

https://heller.brandeis.edu/news/items/releases/2023/impact-...