Loving v. Virginia 388 U.S. 1- This link opens in a new window
"In a unanimous decision, the Court held that distinctions drawn according to race were generally "odious to a free people" and were subject to "the most rigid scrutiny" under the Equal Protection Clause. The Virginia law, the Court found, had no legitimate purpose "independent of invidious racial discrimination." The Court rejected the state's argument that the statute was legitimate because it applied equally to both blacks and whites and found that racial classifications were not subject to a "rational purpose" test under the Fourteenth Amendment. The Court also held that the Virginia law violated the Due Process Clause of the Fourteenth Amendment. "Under our Constitution," wrote Chief Justice Earl Warren, "the freedom to marry, or not marry, a person of another race resides with the individual, and cannot be infringed by the State.""
https://www.oyez.org/cases/1966/395