There is an article in the Chronicle on the movie "Guess Who's Coming to Dinner" and how controversial it was when it came out in 1967. It was a bold step. Here is an excerpt from the article by Ruthe Stein.
"But the 1960s were a different time. When Poitier and Houghton smooch in the back of a cab from SFO, it was the first time a white actress and a black actor had kissed in a major motion picture. Laws against miscegenation were on the books in 16 Southern states. A movie that couldn't be shown in one area of the country was a bad investment. Between the time the film was shot and released, a Supreme Court ruling, Loving vs. Virginia, overturned laws against interracial marriages.
But they remained a sensitive issue not just in the South. In September of '67, a few months before "Dinner's" release, Secretary of State Dean Rusk offered to resign from the cabinet after his daughter, a Stanford student, married a black man."